Complex sentence: Most of the high ranking Palmyrene officials were executed, while Zenobia's and Vaballathus's fates are uncertain, with each historian proposing different theories, according to Zosimus, Vaballathus died on the way to Rome, but this theory has been neither confirmed nor disproved.
Split into simpler sentences: Most of the high ranking Palmyrene officials were executed, while Zenobia and Vaballathus's fates remain uncertain. According to Zosimus, Vaballathus died on the way to Rome, but this theory has been neither confirmed nor disproved.