Complex sentence: After ending his commissionerships in the early 1960s, he became a vice president of The Scout Association and, in 1966, upon ending nearly all of his official roles with The Scout Association, he was made Honorary Commissioner for Life.
Split into simpler sentences: After ending his commissionerships in the early 1960s, the became Vice President for The Scout Association. And in 1966, upon ending nearly all of his official Scout tasks, he was made Honorary Commissioner for Life.