Complex sentence: His father was presumably Lucius Bruttius Maximus, who was Proconsul of Cyprus in 80 and his mother was a member of the Fulvii Rustici (see gens Fulvius), a senatorial family from Cisalpine Gaul.
Split into simpler sentences: His father was presumably Lucius Bruttius Maximus, who was Proconsul of Cyprus in 80. His mother was a member of the Fulvii Rustici, a senatorial family from Cisalpine Gaul.