Complex sentence: In the United States, street food vendors are credited with supporting New York City's rapid growth by supplying meals for the city's merchants and workers and the proprietors have had a goal of upward mobility, moving from selling on the street to their own shops.
Split into simpler sentences: In the United States, street food vendors are credited with supporting New York City's rapid growth by supplying meals for the city's merchants and workers. Proprietors of street food in the United States have had a goal of upward mobility, moving from selling on the street to their own shops.