Simplify the following text for a Grade 9 native English-speaking person.
Original: Maximilian Franz Joseph Cornelius Wolf ( June 21 , 1863 â `` October 3 , 1932 ) was a German astronomer and a pioneer in the field of astrophotography .
Simplified: Maximilian Franz Joseph Cornelius Wolf ( June 21 , 1863 â `` October 3 , 1932 ) was a German astronomer .