Complex sentence: Mary Elizabeth Ellis (born May 11,1979 in Laurel, Mississippi) is an American actress and writer best known for her recurring role as "The Waitress" on the FX comedy series "It's Always Sunny in Philadelphia".
Split into simpler sentences: Mary Elizabeth Ellis (born May 11,1979) is an American actress. She is best known for her recurring role as The Waitress on the FX comedy series "It's Always Sunny in Philadelphia".