Complex sentence: Early on May 22, the NHC declared Alberto a remnant area of low pressure after the system failed to maintain convection and dissipated; at this time the cyclone was located roughly south-southeast of Cape Hatteras, North Carolina.
Split into simpler sentences: Early on May 22, Alberto degenerated into a remnant area of low pressure, after failing to maintain convection. At the time, it was located about south-southeast of Cape Hatteras, North Carolina.