Complex sentence: He founded the design firm Fletcher/Forbes/Gill Colin Forbes and Bob Gill in 1962, which became Crosby/Fletcher/Forbes in 1965, and evolved into Pentagram in the 1972, with Forbes, Crosby, Kenneth Grange and Mervyn Kurlansky.
Split into simpler sentences: He founded the design firm Fletcher/Forbes/Gill with Colin Forbes and Bob Gill in 1962. New partners joined, and The partnership evolved into Pentagram in 1972, with Forbes, Crosby, Kenneth Grange and Mervyn Kurlansky.