Complex sentence: They have been rapidly updating their network and services by installing miles of fiber optic cable currently offer ADSL at rates up to 768K/1.5M and extending as far as 7 miles from town.
Split into simpler sentences: They have been rapidly updating their network and services by installing miles of fiber optic cable. ADSL is available at rates of up to 768K/1.5M and extending as far as 7 miles from town.