Complex sentence: The position of the engine over the wing, compared to under-wing, also shielded people on the ground from intake noise during flyovers; this shielding effect is also present for aft-mounted engines.
Split into simpler sentences: The position of the engine over the wing, compared to under-wing, also shielded people on the ground from intake noise during flyover. This shielding is also present for aft-mounted engines.