Complex sentence: In 1973, a new family of buses is launched-the H9 bus, with the engine mounted at the rear; it would be followed in 1984 by the high-capacity H10 model.
Split into simpler sentences: In 1973, a new family of buses is launched-the H9 bus, with the engine mounted at the rear. It would be followed in 1984 by the high-capacity H10 model.