Complex sentence: Slowly improving with increasing knowledge of physics I built a model of FTL based physics piece by piece, this has now gone through hundreds of iterations but when you are effectively rebuilding the wheel it turns out to be pretty difficult.
Split into simpler sentences: Slowly improving with increasing knowledge of physics I built a model of FTL based physics piece by piece. This has now gone through hundreds of iterations but when you are effectively rebuilding the wheel it turns out to be pretty difficult.