Simplify the following text for a Grade 7 native English-speaking person.
Original: The Province of Laguna was named after Laguna de Bay , the body of water that forms its northern boundary . Laguna de Bay , in turn , was named after the town of Bay ( Laguna de Bay is Spanish which means `` Lake of Bay '' ) , the first provincial capital .
Simplified: Laguna is named after `` La Laguna '' which means the lake , meaning Laguna de Bay .