Complex sentence: Various motorized monowheels were developed and demonstrated during the 1930s without commercial success and Charles F Taylor was granted a patent for a'vehicle having a single supporting and driving wheel' in 1964 after some 25 years of experimentation.
Split into simpler sentences: Various motorized monowheels were developed and demonstrated during the 1930s without commercial success. In 1964 Charles F Taylor was granted a patent for a'vehicle having a single supporting and driving wheel' after some 25 years of experimentation.