Complex sentence: After a failed attempt to cross the Misty Mountains via the Redhorn Pass across the flank of Caradhras, the company are forced to try a more perilous path through the Mines of Moria, where they are attacked by the Watcher in the Water before the gate.
Split into simpler sentences: After a failed attempt to cross the Misty Mountains through the Redhorn Pass across the flank of Caradhras, the company are forced to try a more perilous path through the Mines of Moria. They are attacked by the Watcher in the Water before the gate.