Complex sentence: Soon after, Larry turns down an opportunity to meet with mathematicians at CERN in Geneva and drops his course load for the following semester, leading Charlie to realize Larry is once again leaving, and leaving all of his work to Charlie.
Split into simpler sentences: Soon after, Larry turns down an opportunity to meet with mathematicians at CERN, in Geneva, and drops his course load for the following semester. This leads Charlie to realize Larry is once again leaving, and leaving all of his work to Charlie.