Complex sentence: On 21 July 1966 Engen became Captain of USS "America", during this command the USS Liberty incident took place and "America" launched aircraft to engage the attackers before being ordered to recall the aircraft.
Split into simpler sentences: On 21 July 1966, Engen became Captain of USS "America". During this command the USS Liberty incident took place and "America" launched aircraft to engage the attackers before being ordered to recall the aircraft.