Complex sentence: On two occasions, he had to leave France for conspiring against the government of his mother and of her Prime Minister, Cardinal Richelieu; and after waging an unsuccessful war in Languedoc leading to the Battle of Castelnaudary in 1632, he took refuge in Flanders.
Split into simpler sentences: On two occasions, he had to leave France for conspiring against the government of his mother and her Prime Minister Cardinal Richelieu. After waging an unsuccessful war in Languedoc leading to the Battle of Castelnaudary in 1632, he took refuge in Flanders.