Complex sentence: In late 1980, he met George Tate, who found the product worthwhile and entered into a marketing agreement with Ashton-Tate and renamed the Vulcan product dBASE.
Split into simpler sentences: In late 1980 he met George Tate, who found the product worthwhile. He entered into a marketing agreement with Ashton-Tate and renamed the Vulcan product dBASE.