Complex sentence: His son Pierre-Louis Lions is also a well-known mathematician who was awarded a Fields Medal in 1994, in fact both Father and Son have also both received recognition in the form of Honorary Doctorates from Heriot-Watt University in 1986 and 1995 respectively.
Split into simpler sentences: His son Pierre-Louis Lions is also a well-known mathematician who was awarded a Fields Medal in 1994. In fact both Father and Son have also both received recognition in the form of Honorary Doctorates from Heriot-Watt University in 1986 and 1995 respectively.