How is space-time bent by black holes? I just read When a star becomes a black hole, does its gravitational power become stronger? and it confused me a bit;

I always thought black holes are supermassive and that is why they bend space-time. But it is said therein that the black hole is less massive than the star that created it (and it seems logical if we think about that - indeed, the star exploded and released a lot of matter). 

Thus my question: How can a black hole bend space-time more than the star which created it?
It doesn't bend it more. It is just that the matter of the star is now concentrated in a very compact region of space. So, previously you could get only to the surface of the star but now as the star is very compact, you can get much nearer and thus you will experience a greater gravitational force. 

I had a similar discussion here. Check it out and maybe your question will be answered.