Complex sentence: This is a rough driving surface created by the nature, such as sand, gravel, river, mud, snow and others.The terrain are meant for vehicles which are properly equipped with off-road equipment.
Split into simpler sentences: This is a rough driving surface created by the nature, such as sand, gravel, a river, mud, snow and others. These terrains can only be travelled on by vehicles that are properly equipped with off-road equipment.