Complex sentence: Dylan's wife, Sara, was present at those final shows, and during the final show of the tour (which took place on Valentine's Day), Dylan broke from the standard setlist to play Sara's favorite song, "Mr. Tambourine Man".
Split into simpler sentences: Dylan's wife, Sara, was present at those final shows. During the final show of the tour (which took place on Valentine's Day), Dylan broke from the standard setlist to play Sara's favorite song, "Mr. Tambourine Man".