Complex sentence: Tundra Buggies are built very high off the ground to ensure guest safety and only use existing trails that were built by the Canadian and American Armed Forces in the 1950s and 1960s.
Split into simpler sentences: Tundra Buggies are built very high off the ground to ensure guest safety. These vehicles only use existing trails on the tundra that were built by the Canadian and American Armed Forces in the 1950s and 1960s.