Complex sentence: Despite being initially angered over Ms. Avery's attitude, Caitlin ultimately attended her farewell party learning that she took Caitlin's opinion to heart and accepted the re-assignment after all.
Split into simpler sentences: Despite being initially angered over Ms. Avery's attitude, Caitlin ultimately attended her farewell party. At the party, Caitlin learned that Ms. Avery took her opinion to heart and accepted the re-assignment after all.