Simplify the following text for a Grade 16 native English-speaking person.
Original: Composite materials , often shortened to composites , are engineered or naturally occurring materials made from two or more constituent materials with significantly different physical or chemical properties which remain separate and distinct at the macroscopic or microscopic scale within the finished structure .
Simplified: Composite materials ( or composites for short ) are engineered materials made from more than one material with very different physical or chemical properties and which remain separate and able to be told apart on a macroscopic level inside the composite .