Complex sentence: By the mid 18th century, chocolate was extremely popular in upper and middle class circles, particularly in the form of hot chocolate, including with Charles-Alexander of Lorraine, the Austrian governor of the territory.
Split into simpler sentences: By the mid 18th century, chocolate was extremely popular in upper and middle class circles, particularly in the form of hot chocolate. Among them was Charles-Alexander of Lorraine, the Austrian governor of the territory.