Complex sentence: The next two years followed the same pattern of training exercises and cruises to Norway in the summer, with the exception of 1912 when, due to the Agadir Crisis, the cruise only went into the Baltic.
Split into simpler sentences: The next two years followed the same pattern of training exercises and cruises to Norway in the summer, with the exception of the summer cruise in 1912. Due to the Agadir Crisis, the cruise only went into the Baltic.