Complex sentence: The two siblings had been very close, and Olav later said that it took his wife more than ten years to come to term with it., but he did not think that she ever really got over her sister's death.
Split into simpler sentences: The two siblings had been very close, and Olav later said that it took his wife more than ten years to come to term with it. But he did not think that she ever really got over her sister's death.