Complex sentence: Nevertheless, the 19th Bombardment Squadron of the 22nd BG continued to fly missions in the B-26, and the B-26 flew its last combat mission in the theatre on 9 January 1944.
Split into simpler sentences: Nevertheless, the 19th Bombardment Squadron of the 22nd BG continued to fly missions in the B-26. The B-26 flew its last combat mission in the theatre on 9 January 1944.