Complex sentence: He created a new series for Amsterdam-based Telescreen adapted from the "Frog" books by Max Velthuijs; was a writer for The Little Bear Movie and wrote the first Dutch-produced feature film for children based on Dick Bruna's "Miffy" books.
Split into simpler sentences: He created a new series for Amsterdam-based Telescreen adapted from the "Frog" books by Max Velthuijs, and he also was one of the screenwriters for "The Little Bear Movie". Still wrote the first Dutch-produced feature film for children based on Dick Bruna's "Miffy" books.