Complex sentence: After the Fall of Constantinople, Mehmed claimed the title of "Caesar" of Rome ("Kayser-i Rûm"), although this claim was not recognized by the Patriarch of Constantinople, or Christian Europe.
Split into simpler sentences: After the Fall of Constantinople, Mehmed claimed the title of "Caesar" of Rome ("Kayser-i Rûm"). The claim was not recognized by the Patriarch of Constantinople, or Christian Europe.