Original sentence: Shortly after graduation in 1967, McCoy joined Unimark International a design firm employing many key figures in American Modernist graphic design, Massimo Vignelli, Ralph Eckerstrom of Container Corporation and Herbert Bayer
Edited sentence: Shortly after graduation in 1967, McCoy joined Unimark International; a design firm which employed many key figures in American Modernist graphic design, Massimo Vignelli, Ralph Eckerstrom of Container Corporation and Herbert Bayer