Complex sentence: Following the victory, Palmyra's chief Odaenathus was proclaimed king but was assassinated in 267 and succeeded by his minor son, under the regency of queen Zenobia, who started invading the Romans eastern provinces in 269.
Split into simpler sentences: Following the victory, Palmyra's chief Odaenathus was proclaimed king but was assassinated in 267. He was succeeded by his minor son, under the regency of queen Zenobia, who started invading the Romans eastern provinces in 269.