Complex sentence: Jimmy Boyd (January 9,1939--March 7,2009) was an American singer, musician, and actor known for his recording of the song "I Saw Mommy Kissing Santa Claus".
Split into simpler sentences: Jimmy Boyd (January 9,1939--March 7,2009) was an American singer, musician, and actor. He was known for his recording of the song "I Saw Mommy Kissing Santa Claus".