Complex sentence: However, under the leadership of the exiled William the Silent, the northern provinces continued their resistance and managed to oust the Habsburg armies and, in 1581, established the Republic of the Seven United Netherlands.
Split into simpler sentences: However, under the leadership of the exiled William the Silent, the northern provinces continued their resistance. They were eventually able to oust the Habsburg armies, and in 1581 they established the Republic of the Seven United Netherlands.