In front of a laundromat and The Gulch of San Francisco, there is a man down on the ground, a man on a cellphone, and a couple of women walking by.
People are going about their normal business in San Francisco, and in front of this laundromat is no exception.
The man on the ground, the man on a cellphone and the couple of women can be referred to collectively as 'People'. Also 'going about their normal business' is a simpler rephrasing of the individual actions they were said to be doing, 'down on the ground', 'on a cellphone', 'walking by'.
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