Complex sentence: Existing games with a first person or fixed-camera perspective can be ported to VR with some development effort, however, Oculus has stated that the best virtual reality experiences are those that are designed, from the beginning, for the Rift.
Split into simpler sentences: Existing games with a first-person or fixed-camera perspective can be ported to VR with some development effort. However, Oculus has stated that the best virtual reality experiences are those that are designed, from the beginning, for the Rift.