Simplify the following text for a Grade 6 native English-speaking person.
Original: Concrete can be made to have high compressive strength , e.g. many concrete structures have compressive strengths in excess of 50 MPa , whereas a material such as soft sandstone may have a compressive strength as low as 5 or 10 MPa .
Simplified: Concrete can be made to have high compressive strength e.g. many concrete floors have compressive strength of 3000 p.s.i. .