Complex sentence: While at Iowa, he did editorial cartoons for the school's paper, the Daily Iowan, and his work caught the attention of the Des Moines Tribune where he worked from 1952 to 1957.
Split into simpler sentences: While at Iowa, he did editorial cartoons for the Daily Iowan. His work caught the attention of the Des Moines Tribune where he worked from 1952 to 1957.