Complex sentence: He supported the German king Rudolph of Habsburg against his rival King Ottokar II of Bohemia and in reward received the Duchy of Carinthia with the Carniolian march in 1286.
Split into simpler sentences: He supported the German king Rudolph of Habsburg against his rival King Ottokar II of Bohemia. In reward, he received the Duchy of Carinthia with the Carniolian march in 1286.