Complex sentence: Some sources say he was Vytenis' ostler, others that he was of peasant stock, some historians consider him as the son or grandson of Lithuanian or Yatvingian duke Skalmantas.
Split into simpler sentences: Some sources say he was Vytenis' ostler, others that he was of peasant stock. Some historians consider him as the son or grandson of Lithuanian or Yatvingian duke Skalmantas.