Complex sentence: Cross Street was built in the 1820s and was originally mainly a housing estate for Indian migrant workers, mainly boatmen who and operated shops selling goat's milk, mutton and herbs.
Split into simpler sentences: Cross Street was built in the 1820s and was mainly an Indian housing estate. In the 1820s, mainly Indian boatmen lived on this street and operated shops selling goat's milk, mutton and herbs.