Complex sentence: By 1836, market gardening had become so extensive around Stretford that one writer described it as the "garden of Lancashire"; in 1845 more than 500 tons of vegetables were being produced for the Manchester market each week.
Split into simpler sentences: By 1836, market gardening had become so extensive around Stretford that one writer described it as the "garden of Lancashire". In 1845, over 500 tons of vegetables were being produced for the Manchester market each week.