Complex sentence: Moreover, Senyavin was to assume supreme command of the joint Anglo-Russian fleet (as the senior officer of the two), while two Russian ships ("Rafail " and"Yaroslav") were to be left in Lisbon for repairs.
Split into simpler sentences: Moreover, Senyavin was to assume supreme command of the joint Anglo-Russian fleet (as the senior officer of the two). Two Russian ships ("Rafail " and"Yaroslav") were left in Lisbon for repairs.