Complex sentence: With the disintegration of the Golden Horde after the death of Öz Beg Khan in 1341, both Poland and Hungary started to expand towards the steppe zone in the 1340s.
Split into simpler sentences: With the disintegration of the Golden Horde after the death of Öz Beg Khan in 1341. Both Poland and Hungary started to expand towards the steppe zone in the 1340s.