: Please advise on this comma among semi-colons and provide a more concise sentence I created this question for two reasons: I want to know if it is proper to place a comma after the word

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Actually, both commas should be removed from that sentence. The first one is a comma splice; it should be removed and replaced with a period, to create two complete sentences. That alone will help break up your unwieldy passage and make it easier to read.
The second comma should be removed because you don't put punctuation after the conjunction near the end of a list of items: parsley, sage, rosemary, and thyme. (In addition, your semicolons can be converted to commas. Generally, you only use semicolons to separate items in a list if one or more of the items contain commas themselves, and you need to use the semicolon as a sort of "supercomma.")
Because the items in the list are so long and unwieldy, if it were up to me I'd probably convert them to a bulleted list, if my project style guide permitted it:

124 delegates from 12 countries attended the Symposium and were met with multiple workshops and speeches. Here are a few:

Scaling Conservation Ag to Confront the Upcoming Famine
Permaculture: A tool for self-reliance
Opportunities & Challenges for Reversing Soil Fertility Depletion and Increasing Crop Productivity.

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