Complex sentence: He sent his frigates out again to scout for Córdoba as his main squadron cruised off the Cape in anticipation; that night HMS "Colossus" collided with HMS "Culloden", causing severe damage.
Split into simpler sentences: He sent his frigates out again to scout for Córdoba as his main squadron cruised off the Cape in anticipation. That night HMS "Colossus" collided with HMS "Culloden", inflicting severe damage.