Complex sentence: On release from jail, he teamed up with Clarence Lee Shaffer, Jr., James Dalhover, and Charles Geisking, and the gang proceeded to steal cars and commit armed robberies across Indiana, mostly of grocery stores.
Split into simpler sentences: On release from jail, he teamed up with Clarence Lee Shaffer, Jr., James Dalhover, and Charles Geisking. The gang stole cars and committed armed robberies across Indiana, mostly of grocery stores.