Complex sentence: Mark Hallman (born August 1,1951) is an American producer, songwriter and multi-instrumentalist most notably known for his work with Carole King, Ani Difranco and Eliza Gilkyson.
Split into simpler sentences: Mark Hallman (born August 1,1951) is an American producer, songwriter and multi-instrumentalist. He has worked with Carole King, Ani Difranco, and Eliza Gilkyson.