Complex sentence: Sources vary as to by whom--his mother, friends, the Polish king--but perhaps by Krzysztof Zbaraski, ambassador of the Commonwealth to the Ottomans, who in 1622 paid 30,000 thalers in ransom for all prisoners of war captured at the Battle of Cecora.
Split into simpler sentences: Sources vary as to his benefactor--his mother, friends, the Polish king--but perhaps by Krzysztof Zbaraski, ambassador of the Commonwealth to the Ottomans. In 1622 he paid 30,000 thalers in ransom for all prisoners of war captured at the Battle of Cecora.