Simplify the following text for a Grade 10 native English-speaking person.
Original: Striking MazatlÃ n as a marginal hurricane on the 20th , its upper level portion moved northeast thereafter spurring cycle-genesis in the western Gulf of Mexico along the frontal zone , causing heavy rains along the Middle Texas coast .
Simplified: Striking MazatlÃ n as a marginal hurricane on the 20th , the remains of the system caused heavy rains along the Middle Texas coast .