Complex sentence: He has a son, James William Goodman (born 1981) who is currently teaching dance at the Goodman Dance Centre, from his marriage to his second wife Lesley, who also taught dancing at his dance schools in Dartford and Gravesend.
Split into simpler sentences: He has a son, James William Goodman (born 1981) who is currently teaching dance at the Goodman Dance Centre. His second wife Lesley (mother of James) also taught dancing at his dance schools in Dartford and Gravesend.