re - crys - tal - lize
There are many reasons to learn how to divide recrystallize into syllables. Separating a word like recrystallize into syllables is mainly to make it easier to read and pronounce. The syllable is the smallest sound unit in a word, and the separation of the recrystallize into syllables allows speakers to better segment and emphasize each sound unit.
Knowing how to separate recrystallize into syllables can be especially useful for those learning to read and write, because it helps them understand and pronounce recrystallize more accurately. Furthermore, separating recrystallize into syllables can also be useful in teaching grammar and spelling, as it allows students to more easily understand and apply the rules of accentuation and syllable division.
In the case of the word recrystallize, we find that when separating into syllables the resulting number of syllables is 4. With this in mind, it's much easier to learn how to pronounce recrystallize, as we can focus on perfecting the syllabic pronunciation before trying to pronounce recrystallize in full or within a sentence. Likewise, this breakdown of recrystallize into syllables makes it easier for us to remember how to write it.