And now we will expound on what we explained at the beginning (of Hakdama 2). That [there is a way for a person can rectify all of his Nefesh, Ruach, and Neshama (NaRaN) even in one gilgul where he does not require another gilgul]. [Further translation required here.] Sometimes a person can reach all of his Nefesh, Ruach, and Neshama together at one time, in one body, and he does not require many gilgulim; he can complete all three [souls] in only one gilgul.
The concept is that here, when a person is reincarnated [I assume this means after blemishing his Nefesh, Ruach, and Neshama that were together in one body, in his next gilgul], he is given only a Nefesh. If he merits to rectify it completely, the Ruach is unable to come join it [because only the Nefesh is rectified,] but the Ruach is missing rectification [because it was blemished]. There is one way to fix it, and that is when he fixes the Nefesh completely (as we described above), when that person sleeps at night, he gives away his Nefesh into the hands of Hashem, as we know, "B'yadecha, afkid Ruchi..."
Thus, it is possible that his Nefesh can remain above in a sticking (clinging) to the "Be'er haElyon" in the secret of "Mayin Nukvin," as it was explained to us in Sha'ar haTefilah. When one lies down at night, [and the Nefesh returns above,] when he wakes from his sleep in the morning, [instead of his Nefesh returning and entering into him,] his Ruach alone can enter into him, and so it is like he is literally reincarnated again in another body [although he is still in the same body], and so he goes forth and fixes [his Ruach], until he rectifies it completely.
Then, his Nefesh can return into that same body, since both [the Nefesh and now the Ruach] are both rectified. So the Ruach is clothed over the Nefesh, and the Nefesh becomes a Merkava (a chariot) to it. And afterward, if he merits to rectify the Ruach completely, both the Nefesh and the Ruach may leave the body at night at the time that he goes to sleep (in the secret of giving them away, as we described), and these souls will remain there above.
Then in the morning when he wakes up from his sleep, his Neshama alone will enter into him. And when he rectifies it, and completes it, the Nefesh and the Ruach [that he already rectified] will return, and then all three will connect together in this same body, and [I assume the Nefesh and the Ruach] will become a Merkava (chariot) [for the Neshama], as is known, and this person will no longer require any additional gilgulim.