Complex sentence: Following her first film, in 1897 Gaumount makes Guy the head of the productions for the film studio and during this time she produces over 400 films McMahan, Alison J. (1997).
Split into simpler sentences: Following her first film, in 1897 Gaumount made Guy the head of productions for the film studio. During this time she produced over 400 films McMahan, Alison J. (1997).