Complex sentence: Oberto was Captain of the People in Genoa and led its naval forces in the victory of La Meloria against Pisa in 1284 while Lamba won a major battle against Venetian Andrea Dandolo at Curzola in 1298.
Split into simpler sentences: Oberto was Captain of the People in Genoa and led its naval forces in the victory of La Meloria against Pisa in 1284. Lamba Doria won a major battle against Venetian Andrea Dandolo at Curzola in 1298.