Complex sentence: Kolb and Dill's farewell act was on May 1 and they departed for Australia on May 5 on the "Sierra" at 2:10 p.m. heading to Honolulu.
Split into simpler sentences: Kolb and Dill's farewell act was on May 1 and they departed for Australia on May 5. They departed on the "Sierra" at 2:10 p.m. heading to Honolulu.