Complex sentence: The line was built with severe curves and gradients of 1 in 50 as the rock was hard and difficult to work, and there was problem providing enough air for the all the pneumatic drills until the steam compressor was replaced by a water turbine in 1897.
Split into simpler sentences: The line was built with severe curves and gradients of 1 in 50 as the rock was hard and difficult to work. There was problem providing enough air for the all the pneumatic drills until the steam compressor was replaced by a water turbine in 1897.