Complex sentence: The Fieschi held the fief of Lavagna from the Holy Roman Emperors from the 11th century, holding the title of Conte di Lavagna, which was used by all males of the family.
Split into simpler sentences: The Fieschi held the fief of Lavagna from the Holy Roman Emperors from the 11th Century onwards. The title of Conte di Lavagna was used by all males of the family.