Complex sentence: His reign saw a major expansion of diplomatic missions to and from Western powers, most notably France, England, and the Vatican as well as Persia, India, China, as well as other neighbouring states.
Split into simpler sentences: His reign saw a major expansion of diplomatic missions to and from Western powers, most notably France, England, and the Vatican. Missions were also sent and received from Persia, India, China, as well as other neighbouring states.