Complex sentence: However, there was no business case or market analysis to justify the construction of these downtown malls, and many residents noted that the enclosed facilities represented the antithesis to the one unique aspect of downtown shopping: street-related stores.
Split into simpler sentences: However, there was no business case or market analysis to justify the construction of these downtown malls. In addition, many residents noted that the enclosed facilities represented the antithesis to the one unique aspect of downtown shopping: street-related stores.