Complex sentence: With the later end of the Portuguese Empire, the British, Dutch and French in particular gained easier access to Persian seaborne trade, although they, unlike the Portuguese, did not arrive as colonisers, but as merchant adventurers.
Split into simpler sentences: With the later end of the Portuguese Empire, the British, Dutch and French in particular gained easier access to Persian sea-born trade. Although they, unlike the Portuguese, did not arrive as colonisers, but as merchant adventurers.