Complex sentence: His sister Adelaide married Richard the Justiciar, duke of Burgundy (the present day Burgundy, part of west Francia), and his daughters, another Adelaide, married Louis the Blind of Provence (Lower Burgundy), and Willa, married Boso of Tuscany.
Split into simpler sentences: His sister Adelaide married Richard the Justiciar, duke of Burgundy (the present day Burgundy, part of west Francia). His daughter another Adelaide married Louis the Blind of Provence (Lower Burgundy), and his daughter Willa married Boso of Tuscany.