Complex sentence: From 1953 to 1966 Strohbach was a music teacher at the gymnasium St. Ursula in Hanover, but continued to work as a freelancer at the theater Landesbühne, which covers performances all over Lower Saxony, from 1951 to 1993.
Split into simpler sentences: From 1953 to 1966 Strohbach was a music teacher at the gymnasium St. Ursula in Hanover. He worked as a freelancer at the theatre Landesbühne, which covers performances all over Lower Saxony, from 1951 to 1993.