Complex sentence: Robert George Pickett (February 11,1938--April 25,2007), known by the pen name Bobby "Boris" Pickett, was an American singer who was known for co-writing and performing the 1962 hit novelty song, "Monster Mash".
Split into simpler sentences: Robert George Pickett (February 11,1938--April 25,2007) was an American singer who found fame under the name Bobby "Boris" Pickett. He was known for co-writing and performing the 1962 hit novelty song, "Monster Mash".