It's similar but not identical to the Prius. The layout and geometry is different but an engineering block diagram would be almost identical. Google "eCVT" transmissions which stands for electronic, continuously variable transmission. They are not the dual cone belted CVTs and are unique to Ford, Toyota and some Toyota licensed vehicles. There are no alternators, starters, clutches, torque converters, transmission bands or valves. There is one belt in the 2012 which only drives the engine ( ICE ) water pump. There are some electric coolant pumps. There are only gears engaging gears and bearings. There is hardly anything to wear. Brake pads can last over 100,000 miles with proper hybrid driving. The transmission is controlled by the smaller of two large, high voltage, 3 phase, synchronous permanent magnet motors which also starts the ICE. The larger motor is the main traction motor and also generates electricity which charges the high voltage battery ( HVB ) when braking. Both motors are enclosed in the eCVT which is one large unit. They are coolant cooled with a separate electric pump and radiator. Everything is blended together by software and power electronics. You don't have to know a thing. It's a seamless operation.
Until you get familiar, put the HVAC in "Auto" and set the temperature, put the car in "D" and go. I still do that after 6 years.