Complex sentence: The first ball differential for Radio-controlled Cars was designed by Cecil Schumacher, a British motor sport engineer, a patent was applied for although it was denied as the idea had already been implemented into a lawn mower.
Split into simpler sentences: The first ball differential for Radio-controlled Cars was designed by Cecil Schumacher, a British motor sport engineer. Although a patent was applied for, it was denied as the idea had already been implemented into a lawn mower.