Complex sentence: Over the next 40 years, there were three rebellions against the Portuguese rule, two of which were led by Migapulle Arachchi, until the Dutch capture of Jaffna fort in 1658.
Split into simpler sentences: Over the next forty years, there were three rebellions against Portuguese rule. Two were led by Migapulle Arachchi, until the Dutch capture of Jaffna fort in 1658.