Complex sentence: After WWII he became an X-Ray technician in Puerto Rico and in the 1950's he moved to Montana and joined the Department of Health, Education and Welfare, and was transferred to Washington, DC were he worked as an X-Ray technician until 1957.
Split into simpler sentences: After WWII he became an X-Ray technician in Puerto Rico and during the 1950's he moved to Montana and joined the Department of Health, Education and Welfare. He was transferred to Washington, DC were he worked as an X-Ray technician until 1957.