Simplify the following text for a Grade 12 native English-speaking person.
Original: Tommy Boyce ( born Sidney Thomas Boyce , September 29 , 1939 â '' November 23 , 1994 ) and Bobby Hart ( born Robert Luke Harshman , February 18 , 1939 , Phoenix , Arizona ) were a prolific songwriting duo , best known for the songs they wrote for The Monkees .
Simplified: Boyce and Hart were a musical and songwriting duo , who worked together in the 1960s and 1970s . Tommy Boyce ( born Sidney Thomas Boyce in 1939 ) and Bobby Hart ( born Robert Luke Harshman in 1939 ) wrote and produced hit records for The Monkees ( `` Last Train To Clarksville '' , `` Valleri '' ) , Jay and the Americans ( `` Come A Little Bit Closer '' ) , Chubby Checker ( `` Lazy Elsie Molly '' ) , and for themselves , with `` I Wonder What She 's Doing Tonight '' and other songs .