Complex sentence: Platform 2 serves the same track as Platform 1 but passengers are not able to join or alight as the doors open only on the Platform 1 side due to the live rail being on the side nearest to Platform 2.
Split into simpler sentences: Platform 2 serves the same track as Platform 1 but passengers are not able to join or alight as the doors open only on the Platform 1 side. This is due to the live rail being on the side nearest to Platform 2.