Complex sentence: Following this, he held the Chair of Mathematical Sciences jointly with the Mathematics and Statistics Groups at the University of Bath; he returned to Swansea in 1999, where he currently holds a Research Professorship.
Split into simpler sentences: Following this, he held the Chair of Mathematical Sciences jointly with the Mathematics and Statistics Groups at the University of Bath. In 1999 he returned to Swansea University, where he currently holds a Research Professorship.