Complex sentence: Pilati signed on at Ermenegildo Zegna nine months later, becoming the head of design at Ermenegildo Zegna and creative director of Agnona, and he oversees Zegna's fashion show and the couture collection.
Split into simpler sentences: Pilati signed on at Ermenegildo Zegna nine months later. More specifically, he became the head of design at Ermenegildo Zegna and creative director of Agnona, and he oversees Zegna's fashion show and the couture collection.