Complex sentence: Manual transmissions were limited to three-speed, column shifted units (with synchromesh in second and third gear only), though there are rumors that a handful of 1957 Chevrolets left the factory with Corvette 4-speed, floor-shifting transmissions.
Split into simpler sentences: Manual transmissions were limited to three-speed, column shifted units (with synchromesh in second and third gear only). There are rumors that a handful of 1957 Chevrolets left the factory with Corvette 4-speed, floor-shifting transmissions.