Complex sentence: The driver is seated at the front of the vehicle and has a single-piece hatch cover that opens to the right in which there are three day periscopes, the centre one can be replaced by an image intensification periscope for night driving.
Split into simpler sentences: The driver is seated at the front of the vehicle and has a single-piece hatch cover that opens to the right and in which there are three day periscopes. The centre one can be replaced by an image intensification periscope for night driving.