Complex sentence: Lisa was deeply saddened when Zak's son Butch was killed in a bus crash in the village and moved out of home when it was clear Zak blamed her for it as she'd fixed the brakes on the vehicle before it crashed.
Split into simpler sentences: Lisa was deeply saddened when Zak's son Butch was killed in a bus crash in the village. She even moved out when it was clear Zak blamed her as she'd fixed the brakes on the vehicle before it crashed.