The first watchers that Peter Henlein made were often given as gifts to important people.

Underline the relative clauses and add commas if it is a non-defining relative clause. (Gạch chân mệnh đề quan hệ và thêm dấu phẩy nếu đó là mệnh đề quan hệ không xác định.)

1. The first watchers that Peter Henlein made were often given as gifts to important people.