Complex sentence: The Mantelli Fossa MF.1 was designed by Adriano Mantelli, an experienced aircraft modeller, and built by Ennio Fossa in his family workshop.
Split into simpler sentences: The Mantelli Fossa MF.1 was designed by Adriano Mantelli, an experienced aircraft modeller. The MF.1 was built by Ennio Fossa in his family workshop.