Complex sentence: Admiral Maarten Harpertszoon Tromp demanded reparation from the Royalist fleet for the Dutch ships and goods taken by them, but having received no satisfactory answer, in 1651 the Netherlands declared war.
Split into simpler sentences: Admiral Maarten Harpertszoon Tromp demanded reparation from the Royalist fleet for the Dutch ships and goods taken by them. Having received no satisfactory answer, in 1651 the Netherlands declared war.