Simplify the following text for a Grade 11 native English-speaking person.
Original: Spacetime also appears to have a simply connected topology , at least on the length-scale of the observable universe . However , present observations can not exclude the possibilities that the universe has more dimensions and that its spacetime may have a multiply connected global topology , in analogy with the cylindrical or toroidal topologies of two-dimensional spaces .
Simplified: However , the universe may have more dimensions and its spacetime may have a multiply connected global topology .