sentence: The train and bus companies have to liaise with each other and the train fares have to remain relatively cheap , i.e. the same price as or less than it would cost to go by car .
modified: The train and bus companies have to liase with each other and the train fares have to remain relatively cheap i.e. the same price or less as it would cost to go by car .
transformation: SPELL, PUNCT, PREP, PREP