Complex sentence: The company was founded by Andrew Chernak, president and head sculptor, and Ray Rubin, vice president and head artist, when they reorganized "Canterbury Pewter Ltd.", a gift-market sculpting business which they had established in 1972.
Split into simpler sentences: The company was founded by Andrew Chernak, president and head sculptor, and Ray Rubin, vice president and head artist. Chernak and Rubin had previously partnered in "Canterbury Pewter Ltd.", a gift-market sculpting business which they had established in 1972.