Complex sentence: About 1570 John Reynolds of Clonduff, the legal chieftain of Muintir Eolais built a Castle as his residence at the townland of Gowly on Lough Scur, and obtained many confiscated lands in south county Leitrim after the defeat of Irish chieftains in the nine years war.
Split into simpler sentences: About 1570 John Reynolds of Clonduff, the legal chieftain of Muintir Eolais built a Castle as his residence at the townland of Gowly on Lough Scur. He then obtained many confiscated lands in south county Leitrim following the defeat of local Irish chieftains in the nine years war.