Simplify the following text for a Grade 10 native English-speaking person.
Original: Leopold Poetsch ( or PÃ tsch ) ( 18 November 1853 - 16 October 1942 ) was a German Professor and a high school history teacher of Adolf Hitler who influenced the future leader 's later views .
Simplified: Leopold Poetsch was a German professor and a high school teacher of Adolf Hitler who influenced the future leader 's later views .