Complex sentence: The Physics Model-This new model is based on a union of FTL physics and Relativity with Quantum Mechanics and as such is currently very much fringe physics, but then all new ideas start on the fringe.
Split into simpler sentences: The Physics Model-This is a new physics model (theory) based on a union of FTL physics with Relativity and with Quantum Mechanics. As such this model is currently very much fringe physics, but then all new ideas start on the fringe.