Complex sentence: The Scots had been victorious in defeating the English at the Battle of Stirling Bridge in 1297, however this was countered by Edward I of England's victory at the Battle of Falkirk (1298).
Split into simpler sentences: The Scots had been victorious in defeating the English at the Battle of Stirling Bridge in 1297. However, this was countered by Edward I of England's victory at the Battle of Falkirk (1298).