Would someone clarify the rules for multiplayer?

The grammar is so bad I can't get what they are trying to say:

I put in what I think is the correct grammar, along with a question about what "it" is (are).

Rules change:
When a player , other than the first player , wins a
story, he claims that story for himself. That player
then set s aside that story for himself.

The First Player then shuffles that story card
back into his own story deck, then draws and plays a
new story card. Each other player follows suit
(ie. Their success tokens on the won story are
lost, just like in 2-player), searching their story
deck s for the same story that the First Player has
put into play.

Note: if you have already won the story card
that the First Player has put into play, then you
are "short" one story card (ie. You'll only have
two of them out). However, you still can intercept
the active player’s characters at a story card
even if you don't have it (what is (are) "it (them)"?) out.
If the First Player wins a story, he places that
story in his won pile and pulls out another story.
That won story will not show up again during
the game.

Agree with the first statement

Note: if you have already won the story card
that the First Player has put into play, then you
are "short" one story card (ie. You'll only have
two of them out). However, you still can intercept
the active player’s characters at a story card
even if you don't have it (what is (are) "it (them)"?) out.
If the First Player wins a story, he places that
story in his won pile and pulls out another story.
That won story will not show up again during
the game.

Well, it means that if you have already won a story and the first player draw this already-won story, you cannot place the third story on your side of the board. You might commit as a defender, but you cannot attack on this story.

You can block (defend) despite you don't have the card on your side of the board, just like if there was one in play. But this would'nt work in attack. Once you've won a story, this story doens't exist anymore in your story deck, but your opponent migh play it!!!