Complex sentence: Montpellier bypass is under construction and will chop 20 minutes off travel times from Barcelona to Lyon and beyond, but there is currently no funding for the missing segment of high-speed line between Montpellier and Perpignan which can further cut journey times between the two countries.
Split into simpler sentences: Montpellier bypass is under construction and will chop 20 minutes off travel times from Barcelona to Lyon and beyond. There is on the other hand currently no funding for the missing segment of high-speed line between Montpellier and Perpignan which can further cut journey times between the two countries.