Simplify the following text for a Grade 5 native English-speaking person.
Original: On a walk in the New Jersey Palisades with his nephews , Milton ( March 8 , 1911 - Feb. 1981 ) and Edwin Sirotta , Kasner asked for their ideas .
Simplified: While he was walking with his nephews Milton ( c. 1911 â `` 1980 ) and Edwin Sirotta in New Jersey 's Palisades , Kasner asked them to think of good names .