Complex sentence: Mon-El, however, tells says Kara just as she wakes up that she's in the Fortress of Solitude, as she took Alex and Clark there before passing out, Clark also wakes up, and learns that the silver Kryptonite has left his body.
Split into simpler sentences: Mon-El, however, tells says Kara just as she wakes up that she's in the Fortress of Solitude, as she took Alex and Clark there before passing out. Clark then also wakes up, and learns that the silver Kryptonite has left his body.