Complex sentence: Redferne splits up the pages and they run off with them, but the Warlock catches and tortures Kassandra forcing Redferne to surrender the pages to him; however before he can unite the pages, Redferne pushes the Warlock head onto consecrated ground, burning him.
Split into simpler sentences: Redferne splits up the pages and they run off with them. But before he can unite the pages, Redferne pushes the Warlock head onto consecrated ground, burning him.