Complex sentence: The mall itself sits just a few meters from a known fault-line, making it extremely vulnerable in the unlikely event of a major earthquake although it is believed that the engineers have already strengthened the foundations and the superstructure to counter this.
Split into simpler sentences: The mall itself sits just a few meters from a known fault-line, making it extremely vulnerable in the unlikely event of a major earthquake. Although it is believed that the engineers have already strengthened the foundations to counter this.