Complex sentence: Along with Andrew Moray, Wallace defeated an English army at the Battle of Stirling Bridge in September 1297, and was appointed Guardian of Scotland, serving until his defeat at the Battle of Falkirk in July 1298.
Split into simpler sentences: Along with Andrew Moray, Wallace defeated an English army at the Battle of Stirling Bridge in September 1297. He was appointed Guardian of Scotland and served until his defeat at the Battle of Falkirk in July 1298.