Complex sentence: Topographically, the county is dominated by mountainous and high terrain, with a great variety of natural features including valleys, canyons, gorges, rivers, glacial lakes and dense forests.
Split into simpler sentences: Topographically, the county is dominated by mountainous and high terrain, with a great variety of natural features. It consists of mountains, valleys, canyons, gorges, rivers, glacial lakes and dense forests.