An user French
says…

C'est
  ainsi
Adverb
  qu'il
  décrit
Verb
 l'état  profondément
Adverb
  endormi
Verb
  mais
Coordinating conjunction
  pleinement
Adverb
  conscient
Adjective
  qu'il
  reproduira
Verb
  ensuite
Adverb
.

This is how he describes the deeply asleep but fully conscious state that he will then reproduce.
Words and sentences
New
c'est

  1. it is (used to define the preceding word)
  2. it is (used to introduce a focus)
  3. this is

New
ainsi

in this way, thus

New
décrit

past participle of décrire

New
endormi

New
mais

New
pleinement

completely, all over

New
conscient

  1. Physically alert; conscious
  2. aware of something's implications or consequences

New
ensuite

in turn, subsequently, thereafter, then

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