Complex sentence: Nine extant drawings show Seurat focusing on each one of the main figures in the painting and using conté crayon monochrome to work out means of deploying light and shade to imply space and plasticity that would find their final realisation in the colours of the finished oil painting.
Split into simpler sentences: Nine extant drawings show Seurat focusing on each one of the main figures in the painting. Many of the detailed findings Seurat made in these monochrome drawings were to find their final realisation when translated into the colours of the finished oil painting.