Complex sentence: In 1747, he was named as the Director-General (the second highest post in the Dutch East Indies) when in 1750,Gustaaf Willem van Imhoff died, Mossel succeeded him as Governor-General of the Dutch East Indies.
Split into simpler sentences: In 1747, he was named as the "Director-General" (the second highest post in the Dutch East Indies). When in 1750,Gustaaf Willem van Imhoff died, Mossel succeeded him as Governor-General of the Dutch East Indies.