Complex sentence: It is the only high hill in an extensive tract of featureless moorland between the head of Loch Lomond and Loch Awe, and its long summit ridge has three tops, the summit being the south-western one.
Split into simpler sentences: It is the only high hill in an extensive tract of featureless moorland between the head of Loch Lomond and Loch Awe. Its long summit ridge has three tops, the summit being the south-western one.