Complex sentence: Before 2003, "Asia Squawk Box" aired from 7am to 10am, then because of the cancellation of "Asia Wake Up Call", "ASB" moved to the 6 to 9AM timeslot.
Split into simpler sentences: Before 2003, "Asia Squawk Box" aired from 7am to 10am. As a result of the cancellation of "Asia Wake Up Call", "ASB" moved to the 6 to 9am timeslot.