Complex sentence: Upon graduation from college, he spent several years servicing and installing radios and experimenting with electronic devices, and from 1940 to 1941 he was Supervisor of the Radio Project, NYA, in Portland.
Split into simpler sentences: Upon graduation from college, he spent several years servicing and installing radios and experimenting with electronic devices. From 1940 to 1941 he was Supervisor of the Radio Project, NYA, in Portland.