Complex sentence: France later supported the militarily strong but economically weak Sweden--from 1630 to 1632, the cost of Gustavus' army was shorted by 80%, but the strength was increased to over 350%.
Split into simpler sentences: France later supported the militarily strong but economically weak Sweden. From 1630 to 1632 the cost of Gustavus' army was shorted by 80%, but the strength was increased to over 350%.