Complex sentence: Known as the RailTrail project, phase one would see the railway extended to Nanstallon Halt, phase two to Grogley Halt and phase three to Wadebridge Guineaport.
Split into simpler sentences: Known as the RailTrail project, phase one would see the railway extend to Nanstallon Halt. Phase twr would see the line extended to Grogley Halt and phase three to Wadebridge Guineaport.