Complex sentence: The village of Pooley Bridge is at the northern extremity of the lake, its narrow 16th century bridge straddles the River Eamont as it flows out of Ullswater, it is overlooked by Dunmallard Hill which was the site of an Iron Age fort.
Split into simpler sentences: The village of Pooley Bridge is at the northern extremity of the lake. Its narrow 16th-century bridge straddling the River Eamont as it flows out of Ullswater, it is overlooked by Dunmallard Hill which was the site of an Iron Age fort.