Complex sentence: Gauland was born in 1941 in Chemnitz, a city that became part of East Germany in 1949 and was renamed Karl-Marx-Stadt, and after graduating from high school in 1959, he fled to West Germany.
Split into simpler sentences: Gauland was born in 1941 in Chemnitz, a city that became part of East Germany in 1949 and was renamed Karl-Marx-Stadt. After graduating from high school in 1959, he fled to West Germany.