Complex sentence: In 1993 Fiona moved to the United States where she joined Dr Robert Coffman at the DNAX Research Institute in California, where she developed one of the first mouse models for inflammatory bowel disease by modifying regulatory T cells in mice.
Split into simpler sentences: In 1993 Fiona moved to the United States where she joined Dr Robert Coffman at the DNAX Research Institute in California. While in California Fiona developed one of the first mouse models for inflammatory bowel disease, by modifying regulatory T cells in mice.