Complex sentence: In 1949, Rosetta Jacobs signed a contract with Universal Studios, changing her screen name to Piper Laurie, by which she has been known professionally since, where she met other unfamiliar actors Julie Adams and Rock Hudson.
Split into simpler sentences: In 1949, Rosetta Jacobs signed a contract with Universal Studios, and changed her screen name to Piper Laurie which she has used since then. At Universal, she met other unfamiliar actors Julie Adams and Rock Hudson.