Complex sentence: Gerald and Sheila hire a Handicar, but they get a normal driver who discloses that Timmy has expanded to anyone who can get a wheelchair and a "handi-cap" (referring to the hat worn as part of the driver uniform).
Split into simpler sentences: Gerald and Sheila hire a Handicar, but they get a driver who is a regular person. The driver discloses that Timmy has expanded his business to anyone who can get a wheelchair and a "handi-cap" (referring to the hat worn as part of the Handicar driver uniform).