Complex sentence: Afterwards, "Tromp" escorted several more north-bound convoys before completing its sea trials in early June and the following month departed Sydney bound for Fremantle, escorting a westward-bound convoy.
Split into simpler sentences: Afterwards, "Tromp" escorted several more north-bound convoys before completing its sea trials in early June. The following month she departed Sydney bound for Fremantle, escorting a westward-bound convoy.