Original: He established his own workshop after a brief period as Neri di Bicci's assistant; the shop was renowned for its decorative works, a few of which can be seen in the cloistered church of Empoli.
Simplified: After he had been an assistant to the painter Neri di Bicci he started his own workshop. The shop was famous for its decorative works, a few of which can be seen in the cloistered church of Empoli.