Complex sentence: Matt Shakman (born August 8,1975) is an American film, television, and theatre director-and former child actor-most well known for his work on "It's Always Sunny in Philadelphia".
Split into simpler sentences: Matt Shakman (born August 8,1975) is an American film, television, and theatre director, and former child actor. He is most well known for his work on "It's Always Sunny in Philadelphia".