Simplify the following text for a Grade 6 native English-speaking person.
Original: First published in 1941 , the book tells the story of a pair of mallard ducks who decide to raise their family on an island in the lagoon in Boston Public Garden , a park in the center of Boston , Massachusetts .
Simplified: It was first printed in 1941 . The book is about two mallard ducks who decide to raise their family on an island in the lagoon in Boston Public Garden , a park in the middle of Boston , Massachusetts .