Complex sentence: The pilot's canopy was offset to the left-hand side of the fuselage, while the observer was housed to the right completely within the fuselage, gaining access through a flush-fitting top hatch into his position, nicknamed the "Coal Hole".
Split into simpler sentences: The pilot's canopy was offset to the left-hand side. The observer was housed to the right completely within the fuselage, gaining access through a flush-fitting top hatch into his position, nicknamed the "Coal Hole".