Complex sentence: Little and Great Whernside are the two summits on the ridge to the north and to the west of Angram Reservoir, they reach heights of 605 and 704 metres above sea level.
Split into simpler sentences: Little and Great Whernside are the two summits on the ridge to the north and to the west of Angram Reservoir. They reach heights of 605 and 704 metres above sea level.