Complex sentence: With over 600,000 residents, Yaroslavl is, by population, the largest town on the Volga until it reaches Nizhny Novgorod, it is a large transport node and a great number of important national and regional roads, railways and waterways pass through the city.
Split into simpler sentences: With over 600,000 residents, Yaroslavl is, by population, the largest town on the Volga until it reaches Nizhny Novgorod. It is a large transport node, and a great number of important national and regional roads, railways and waterways pass through the city.