Complex sentence: Kolowrat's rivalry with Metternich intensified when in 1826 the emperor called him to Vienna, where he was elevated to a member of the Austrian State Council responsible for the Interior and Finances; while Metternich favored a strong army, Kolowrat reduced the military budget.
Split into simpler sentences: Kolowrat's rivalry with Metternich intensified when in 1826 the emperor called him to Vienna, where he was elevated to a member of the Austrian State Council responsible for the Interior and Finances. The tensions between him and the chancellor continued: while Metternich favored a strong army, Kolowrat reduced the military budget.