Complex sentence: Among the cars who appeared in the background were ones identical in make and color to Generation 1 Optimus Prime, Sideswipe, Wheeljack and Brawn Megatron stand in front of a car whose licnense is ALXMLN, a reference to artist Alex Milne.
Split into simpler sentences: Among the cars who appeared in the background were ones identical in make and color to Generation 1 Optimus Prime, Sideswipe, Wheeljack and Brawn. Megatrons stand in front of a car whose liscense plate is ALXMLN, a reference to artist Alex Milne.