: Combining sentences I want to say couple of this within one sentence. so my sub sentences would be: We removed the vertical features from the classification process. The removal

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Communicating complicated information can be done better using short sentences, not long ones. It also is easier to check short sentences for clarity and accuracy than to check long ones. Rather than trying to squeeze an explanation that should be a page or two long into a single sentence, aim at writing accurate short sentences.

In the above, I suggested using several short sentences rather than a single long sentence because the short sentences will communicate better. A second reason for using several sentences rather than one is that the presented information contains several different ideas. Treating separate ideas separately makes more sense than muddling them up together. The ideas include (1) vertical features like walls act as misleading connections between terrain and non-terrain (roofs, etc), therefore vertical features are not considered within the classification process; (2) vegetation obscures some oblique surfaces and leads to false connections between terrain and non-terrain.

You might try something along the lines of

We removed one important source of misleading connections between terrain and non-terrain by suppressing vertical features within the classification process. But vegetation with many branches not vertical often obscures or connects to oblique surfaces. The false connections due to vegetation now are the main cause of object misclassification.

Edit: A comment speaks of “ruining the point of splitting the sentences” by starting the next one with But. That may be so, because but
is serving here much like a coordinating conjunction. To avoid the problem, consider the following arrangement, which besides avoiding but, slightly improves the parallelism in form of the two halves of the paragraph.

We removed one important source of misleading connections between terrain and non-terrain by suppressing vertical features within the classification process. False connections due to vegetation remain as the main cause of object misclassification. With many branches not vertical, vegetation often obscures or connects to oblique surfaces.

The comment also claims But at sentence-front “looks informal and out of place in a piece of technical writing”. That notion is echoed in wiktionary's Usage Notes for but:

Beginning a sentence with a coordinating conjunction such as but is considered incorrect by classical grammarians arguing that a coordinating conjunction at the start of a sentence has nothing to connect, but use of the word in this way is very common. It is, however, best to avoid beginning a sentence with but in formal writing. Combining sentences or using however, nevertheless, still, or though is appropriate for the formal style.

That is, some who subscribe to the idea that but cannot serve to start a formal sentence would have you believe that using a longer word like however, nevertheless, still, or though will make it all nice. I'm sure it's so, but also see Mark 9:24.

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