Simplify the following text for a Grade 7 native English-speaking person.
Original: Rapid intensification ensued as Rita moved into the Gulf of Mexico , and Rita became a Category 5 hurricane on September 21 , becoming the third ( now fourth ) most intense hurricane ever recorded in the Atlantic Basin .
Simplified: It moved south of Florida and into the Gulf of Mexico . Rita became a category 5 hurricane very fast , then made landfall .