Complex sentence: Another demonstrator TRAXX F140 AC2, "185 568" was used for tests on the then new HSL-Zuid in 2006, subsequently it was used for tests of the ETCS system.
Split into simpler sentences: Another demonstrator TRAXX F140 AC2, "185 568" was used for tests on the then new HSL-Zuid in 2006. Subsequently, it was used for tests of the ETCS system.