There isn't really an "explanation" for quantum entanglement. It is a fundamental property of the universe, arguably the fundamental property of the universe. But the Right Way to think about it IMHO is this: the quantum wave function is not defined over physical space, it is defined over configuration space. A wave function defined over physical space is a special case that pertains when you are dealing with a system consisting of a single particle, in which case physical space and configuration space are the same. But as soon as you add a second particle, this physical intuition breaks down.

You might also want to read this:

https://flownet.com/ron/QM.pdf