Complex sentence: Sources in the Jerusalem Municipality now claim the city's security cameras were being upgraded at the time the attack took place and not working in the area, and that the police would be reviewing, instead, footage recorded on cameras operated by local businesses.
Split into simpler sentences: Sources in the Jerusalem Municipality now claim the city's security cameras were being upgraded at the time the attack took place and thus not working in the area. They said that the police would be reviewing, instead, footage recorded on cameras operated by local businesses.