Complex sentence: Throughout the 1980s and 1990s, class-action lawsuits claimed that Dow Corning's silicone breast implants caused systemic health problems; first breast cancer, and then a range of autoimmune diseases including lupus, rheumatoid arthritis and various neurological problems.
Split into simpler sentences: Throughout the 1980s and 1990s, class-action lawsuits claimed that Dow Corning's silicone breast implants caused systemic health problems. The claims first centered around breast cancer, and then migrated to a range of autoimmune diseases, including lupus, rheumatoid arthritis and various neurological problems.