Complex sentence: In 2011, Mesaba Airlines began operating flights out of New York's LaGuardia Airport for US Airways under the US Airways Express brand, the service utilizes Saab 340 aircraft and replace the current service being operated by Colgan Air.
Split into simpler sentences: In 2011, Mesaba Airlines began operating flights out of New York's LaGuardia Airport for US Airways under the US Airways Express brand. This codeshare service utilizes Saab 340 aircraft and replaced the service that was being operated by Colgan Air.