Simplify the following text for a Grade 9 native English-speaking person.
Original: Breccia ( or , ) is a rock composed of broken fragments of minerals or rock cemented together by a fine-grained matrix , that can be either similar to or different from the composition of the fragments .
Simplified: Breccia is a type of rock formed of broken fragments of minerals or rock cemented together by a fine-grained matrix . The matrix may be similar to or different from the composition of the fragments .