Complex sentence: Christopher declines, as he thinks that Cliff just wants to antagonize the Ewings again; however, Cliff warns him to not let the Ewings destroy him like they did his mother Pamela.
Split into simpler sentences: Christopher declines, as he thinks that Cliff just wants to antagonize the Ewings again. However, Cliff warns him to not let the Ewings destroy him like they did his mother Pamela.