Complex sentence: Hadrian promoted Hellenism throughout the empire, and Palmyra's urban expansion was modeled on the Greek fashion, leading to many new projects, including the theatre, the colonnade and the temple of Nabu.
Split into simpler sentences: Hadrian promoted Hellenism throughout the empire, and Palmyra's urban expansion was modeled on that of Greece. This led to new projects, including the theatre, the colonnade and the temple of Nabu.