Complex sentence: In 2004, a synagogue was built on the hill in memory of Binyamin Kahane and his wife, who were slain by Arab terrorists and included a Torah scroll that was written in their memory.
Split into simpler sentences: In 2004, a synagogue built on the hill in memory of Binyamin Kahane and his wife, who were slain by Arab terrorists. The building housed a Torah scroll that was written in their memory.