Complex sentence: It was headed by Ivan Pavlovich Bratukhin and built several experimental helicopters over the next decade, all with the same basic design of two rotors with separate engines carried on the ends of outriggers to each side of the fuselage.
Split into simpler sentences: It was headed by Ivan Pavlovich Bratukhin and built several experimental helicopters over the next decade. Each model had the same basic design of two rotors with separate engines carried on the ends of outriggers to each side of the fuselage.