Complex sentence: Mantzavinata had several persons with the surname Mantzaviatos, one of them founded a subdivision in Patras and is known as Mantzavineika, another the "Mantzavinateio Hospital" in Lixouri.
Split into simpler sentences: Mantzavinata had several persons with the surname Mantzaviatos, one of whom founded a subdivision in Patras known as Mantzavineika. Another founded the "Mantzavinateio Hospital" in Lixouri.