Complex sentence: The DB 605AM running initially on C3 and MW-50 improved performance to 1,800 PS (1775 hp) for takeoff, in mid 1944 the requirement for C3 was dropped and B4 + MW-50 was used.
Split into simpler sentences: The DB 605AM, running initially on C3 and MW-50, saw power improved to 1,800 PS (1775 hp) for takeoff. In mid- 1944, the requirement for C3 was dropped and B4 + MW-50 was used.