Complex sentence: A strict definition of a "single drop" refers to a pitch which is completely free of ledges, but because of the difficulty in defining exactly what counts as a single drop there is some debate as to which cave really contains the longest one.
Split into simpler sentences: A strict definition of a "single drop" refers to a pitch which is completely free of ledges. Because of the difficulty in defining exactly what counts as a single drop there is some debate as to which cave really contains the longest one.