Complex sentence: He moved on to the University of Leicester in 1977, where he found an academically stimulating and helpful environment, discovered variations between individual's DNA in 1984, and where he invented and developed genetic fingerprinting.
Split into simpler sentences: He moved on to the University of Leicester in 1977, where he found an academically stimulating and helpful environment. Working in Leicester he discovered a method of showing variations between individual's DNA in 1984, and invented and developed of genetic fingerprinting.