Complex sentence: D'Ascanio designed the first production helicopter, for Agusta, and designed the first motor scooter for Ferdinando Innocenti; after the two fell out he help Enrico Piaggio produce the original Vespa.
Split into simpler sentences: D'Ascanio designed the first production helicopter, for Agusta, and designed the first motor scooter for Ferdinando Innocenti. After the two fell out, D'Ascanio help Enrico Piaggio produce the original Vespa.