Complex sentence: George Witherage Cotton (1821--1892) was a land dealer and Member of the South Australian Legislative Council; a champion of the scheme to put working men onto small blocks (around 20 acres) on which they could carry out agricultural production.
Split into simpler sentences: George Witherage Cotton (1821--1892) was a South Australian land dealer and Member of the South Australian Legislative Council. He was especially notable for being a champion of a scheme in South Australia to put working men onto small blocks of land (around 20 acres) on which they could carry out agricultural production.