Complex sentence: From February 1944 to May 1945 also based at Holme was 1689 Bomber (Defence) Training Flight who flew Hawker Hurricane aircraft on fighter affiliation duties-assisting bomber units to train crews how to defend their aircraft.
Split into simpler sentences: From February 1944 to May 1945 also based at Holme was 1689 Bomber (Defence) Training Flight who flew Hawker Hurricane aircraft on fighter affiliation duties. Fighter affiliation units assisted bomber units to train crews how to defend their aircraft.