Complex sentence: Fleet maneuvers in the North and Baltic Seas followed; the summer cruise in July only went into the Baltic owing to the Agadir Crisis with Britain and France to avoid exposing the fleet to a possible attack.
Split into simpler sentences: Fleet maneuvers in the North and Baltic Seas followed. Because of the Agadir Crisis with Britain and France, the summer cruise in July went only to the Baltic to avoid exposing the fleet to a possible attack.