Complex sentence: A series of further campaigns from this point by the Portuguese remained remained equally unsuccessful and only in 1910, were the Sultans overthrown and Portuguese rule extended over Angoche with the building of new military posts.
Split into simpler sentences: A series of further campaigns from this point by the Portuguese remained remained equally unsuccessful. Only in 1910, were the Sultans overthrown and Portuguese rule extended over Angoche with the building of new military posts.