Complex sentence: After eighteen at Newcastle University, including three years as professor of Quantitative Geography, he moved to work in Leeds in 1992, as part of the establishment of Centre for Computational Geography, which he directed for seven years until suffering a severely disabling stroke in 1999.
Split into simpler sentences: After eighteen at Newcastle University, including three years as professor of Quantitative Geography, he moved to work in Leeds in 1992. Stan directed the Centre for Computational Geography for seven years until suffering a severely disabling stroke in 1999.