Complex sentence: Other important influences were Kant, Vico, F. H. Bradley, J. A. Smith, and Ruskin, who mentor to his father W. G. Collingwood, who became professor of fine arts at Reading University, who also was an important influence.
Split into simpler sentences: Other important influences were Kant, Vico, F. H. Bradley, and J. A. Smith. His father W. G. Collingwood, who became professor of fine arts at Reading University, was a student of Ruskin and was also an important influence.