Complex sentence: Laurence Owen was born in San Francisco and for the first eight years grew up in Berkeley, California and was the second child of Guy Owen and Maribel Vinson and the younger sister of Maribel Owen.
Split into simpler sentences: Laurence Owen was born in San Francisco and for the first eight years grew up in Berkeley, California. She was the second child of Guy Owen and Maribel Vinson and the younger sister of Maribel Owen.