Complex sentence: Later, back in New York, Larriyand Lynn go to a formal dinner of the self-help group, after which marijuana joints are handed round and a young man called Schiavelli instructs the parents how to smoke them.
Split into simpler sentences: Later, back in New York, Larry and Lynn attend a formal dinner of the self-help group. Afterwards, marijuana joints are handed round, and a young man called Schiavelli instructs the parents how to smoke them.