Complex sentence: A day or two later police officers come questioning Jane about Elvira's disappearance, so Jane panics, grabs her barely conscious sister and heads for the location of some of her happiest childhood memories, the beach.
Split into simpler sentences: A day or two later police officers come questioning Jane about Elvira's disappearance and Jane begins to panic. She grabs her barely conscious sister and heads for the location of some of her happiest childhood memories, the beach.