Complex sentence: This request was granted, with Red Cloud subsequently assigned to A Company, 29th Marine Regiment, 6th Marine Division, which participated in the invasion of Okinawa on 1 April 1945.
Split into simpler sentences: This request was granted, with Red Cloud subsequently assigned to the 29th Marine Regiment, 6th Marine Division. In this unit, he participated in the invasion of Okinawa on 1 April 1945.