Complex sentence: After a lodgement extension was granted by the FTA, HART submitted its recovery plan in April 2017 which concluded that completion of the original 21 station route was the only viable option.
Split into simpler sentences: After a lodgement extension was granted by the FTA, HART submitted its "recovery plan" in April 2017. The plan concluded that completion of the original 21 station route was the only viable option.