Simplify the following text for a Grade 12 native English-speaking person.
Original: Heinz Sielmann ( June 2 , 1917 in Rheydt ( now MÃ nchengladbach ) , Germany â `` October 6 , 2006 in Munich ) was a world renowned wildlife photographer , zoologist and documentary filmmaker .
Simplified: Heinz Sielmann ( June 2 1917 in Rheydt , Germany â `` October 6 2006 in Munich ) was a world famous wildlife photographer , zoologist and documentary filmmaker .