Complex sentence: Stage 2 of the project will see quadruplication of the tracks between Kingsgrove and Revesby, with all-stations'local' trains travelling via the Airport line terminating at Revesby.
Split into simpler sentences: Stage 2 of the project will see quadruplication of the tracks between Kingsgrove and Revesby. When complete, all-stations'local' trains travelling via the Airport line will terminate at Revesby.