Complex sentence: During the year of 1615, Tadatomo fought very valiantly during the Battle of Tennoji.Tadatomo led a valiant attack that led up to the death of Sanada Yukimura.
Split into simpler sentences: During the year of 1615, Tadatomo fought very valiantly during the Battle of Tennōji. He led an attack that led up to the death of Sanada Yukimura.