Complex sentence: They also spread and encouraged Buddhism throughout the empire and undertook monumental construction projects including the Grand Canal CIHoCn, p.114: "dug between 605 and 609 by means of enormous levies of conscripted labour".
Split into simpler sentences: They also spread and encouraged Buddhism throughout the empire. A lasting legacy of the Sui dynasty was the Grand Canal CIHoCn, p.114: "dug between 605 and 609 by means of enormous levies of conscripted labour".