Complex sentence: The motivations behind Palestinian violence against Israeli civilians are multiplex, and not all violent Palestinian groups agree with each other on specifics, however a common motive is to eliminate the Jewish state and replace it with a Palestinian Arab state.
Split into simpler sentences: The motivations behind Palestinian violence against Israeli civilians are multiplex, and not all violent Palestinian groups agree with each other on specifics. Nonetheless, a common motive is the desire to destroy Israel and replace it with a Palestinian Arab state.