Complex sentence: In 687, Pepin of Herstal, mayor of the palace of Austrasia, ended the strife between various kings and their mayors with his victory at Tertry and became the sole governor of the entire Frankish kingdom.
Split into simpler sentences: In 687, Pepin of Herstal, mayor of the palace of Austrasia, ended the strife between various kings and their mayors with his victory at Tertry. He became the sole governor of the entire Frankish kingdom.