Simplify the following text for a Grade 7 native English-speaking person.
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 .