Complex sentence: A jockey shifter also known as a slap shifter gets its name from the location of the motorcycle rider's hand when shifting gears, it is under his seat like the position of a jockey's hand while using his riding crop on his horse.
Split into simpler sentences: A jockey shifter, also known as a slap shifter, gets its name from the location of the motorcycle rider's hand when shifting gears. It is under his seat like the position of a jockey's hand while using his riding crop on his horse.