Complex sentence: It departed Sydney on 23 March; the equipment was unloaded at Walvis Bay in mid-April, moving by road and rail to the South African Defence Force Logistics Base at Grootfontein.
Split into simpler sentences: It departed Sydney on 23 March and the equipment was unloaded at Walvis Bay in mid-April. It was then moved by road and rail to the South African Defence Force Logistics Base at Grootfontein.