Complex sentence: Meanwhile, Baligant, the powerful emir of Babylon, has arrived in Spain to help Marsile, and his army encounters that of Charlemagne at Roncesvalles, where the Christians are burying and mourning their dead.
Split into simpler sentences: Meanwhile, Baligant, the powerful emir of Babylon, has arrived in Spain to help Marsile. His army encounters that of Charlemagne at Roncesvalles, where the Christians are burying and mourning their dead.