Complex sentence: Ferri is involved in the clinical and laboratory investigations regarding different autoimmune and neoplastic diseases; in particular, he investigated the pathogenetic role of some viruses in mixed cryoglobulinemia (cryoglobulinemic vasculitis) and systemic sclerosis (scleroderma).
Split into simpler sentences: Ferri is involved in the clinical and laboratory investigations regarding different autoimmune and neoplastic diseases. In particular, he investigated the pathogenetic role of some viruses in mixed cryoglobulinemia (cryoglobulinemic vasculitis) and systemic sclerosis (scleroderma).