Complex sentence: He did not hold any important positions and it was not until 1402 that he became the Komtur of Nessau (Nieszawa) and of Schwetz (Świecie) in 1407.
Split into simpler sentences: He did not hold any important positions until 1402 when he became the Komtur of Nessau (Nieszawa). He was promoted to Komtur of Schwetz (Świecie) in 1407.