Simplify the following text for a Grade 14 native English-speaking person.
Original: However , a few hours later , the system began weakening again , and late on August 19 Erin degenerated into a remnant low pressure area as the circulation dissipated over northeastern Oklahoma .
Simplified: However , a few hours later , the depression began weakening again , and late on August 19 Erin weakened significantly as the circulation dissipated over northeastern Oklahoma .