Complex sentence: In 2016, "Coruisk" became the second vessel on the Oban-Craignure route alongside during the summer timetable period, being replaced at Mallaig by the much smaller and (in between the latter's Lochboisdale-Mallaig sailings).
Split into simpler sentences: In 2016, became the second vessel on the Oban-Craignure route alongside during the summer timetable period. She was replaced at Mallaig for the 2016 season by the much smaller and (in between the latter's Lochboisdale-Mallaig sailings).