Complex sentence: Unable to attain the faster-than-light speeds required to break free, it seems that the "Altares" is about to be crushed into nothingness, although Anna suggests from the Black Hole's rotation that the phenomenon could be a portal to another universe.
Split into simpler sentences: Unable to attain the faster-than-light speeds required to break free, the "Altares" appears set to be crushed out of existence. Calculating the Black Hole's rotation, Anna suggests that the phenomenon could be a portal to another universe.