Complex sentence: In 1564, Nobunaga sent his sister Oichi to be the bride of Azai Nagamasa which aided him in his 1566 conquest for Mino province, and opened the path to Kyoto.
Split into simpler sentences: In 1564, Nobunaga sent his sister Oichi to be the bride of Azai Nagamasa. This aided him in his 1566 conquest for Mino province, and opened the path to Kyoto.