Simplify the following text for a Grade 7 native English-speaking person.
Original: The Animikie Group is a geologic group composed of sediments that were deposited between 2,500 and 1,800 million years ago within the Animikie Basin .
Simplified: The Animikie Group of sediments were deposited between 2.5 and 1.8 billion years ago , within the Animikie Basin .