Complex sentence: Between 1590-1712 the Dutch also possessed one of the strongest navies in the world, allowing for their varied conquests including breaking the Portuguese sphere of influence on the Indian Ocean and in the Orient.
Split into simpler sentences: Between 1590-1712 the Dutch also enjoyed having one of the strongest navies in the world. This allowed for their varied conquests, including breaking the Portuguese sphere of influence on the Indian Ocean and in the Orient.