Complex sentence: About a quarter of the way back from the nose the fuselage deepened in the form of a hump which extended to the tail, which housed a single MK 108 cannon with 45 rounds.
Split into simpler sentences: About a quarter of the way back from the nose the fuselage deepened in the form of a hump which extended to the tail. This hump housed a single MK 108 cannon with 45 rounds.