Complex sentence: For hours the the dark sorcerers struggled against the mages of Saphery to undo the barrier, but in the end, the Dark Elf sorcery proved too much for the High Elves.
Split into simpler sentences: For hours the the dark sorcerers struggled against the mages of Saphery to undo the barrier. In the end, the Dark Elf sorcery proved too much for the High Elves.