Complex sentence: In 1985, Nelson was offered a position by Professor Ron Kaback at the Roche Institute of Molecular Biology, a basic science research center in which Nelson not only continued studies in his subject matter but also had a chance to explore new fields due to plentiful funding.
Split into simpler sentences: In 1985, Nelson was offered a position by Professor Ron Kaback at The Roche Institute of Molecular Biology (RIMB). RIMB was a Basic Science research center in which Nelson not only continued studies in his subject matter but also had a chance to explore new fields due to plentiful funding.