Simplify the following text for a Grade 12 native English-speaking person.
Original: Yet , with the arrival of torrential rains in the Wet season , they swell to mighty waterways , spreading across extensive floodplains and coastal wetlands and giving life to a vast array of freshwater and wetland species .
Simplified: Yet , with the heavy rains in the Wet season , they become mighty waterways , spreading across huge floodplains and coastal wetlands and giving life to many freshwater and wetland species .