Complex sentence: The US took longer than other leading NTC allies to formally recognise the council as Libya's legitimate authority, but it did so on July 15, and it granted accreditation to Ali Aujali as the Libyan Ambassador to the United States on August 15.
Split into simpler sentences: The US took longer than other leading NTC allies to formally recognise the council as Libya's legitimate authority, but it did so on July 15. It granted accreditation to Ali Aujali as the Libyan Ambassador to the United States on August 15.