Simplify the following text for a Grade 11 native English-speaking person.
Original: After causing heavy rains in Sonora , the storm dissipated over the Sierra Madre Occidental and its remnants went on to casue flooding in New Mexico and Texas .
Simplified: After causing heavy rains in Sonora , the storm weakened over the Sierra Madre Occidental and what was left went on to cause flooding in New Mexico and Texas .