Complex sentence: Under the command of Major Pappy Boyington, the unit was equipped with F4U Corsair and after being organized over the course of several months, it was moved to the Russell Islands and ready for combat by 13 September.
Split into simpler sentences: Under the command of Major Pappy Boyington, the unit was equipped with F4U Corsairs. Moved after several months to the Russell Islands, they were ready for combat by 13 September.