Complex sentence: She is best known for her roles as Eliza Jane Wilder on the television series "Little House on the Prairie" and as Fran Castleberry, the younger straight-laced sister of Polly Holliday's character on the sitcom "Flo".
Split into simpler sentences: She is best known for her performance as Eliza Jane Wilder on the TV series "Little House on the Prairie". She also played Fran Castleberry, the sister of Polly Holliday's character on the show "Flo".