The context of the sentence is that I have read a book in English, and I want to read it in French as well. I would say something like
"J’adore ce livre! Je veux le lire en française aussi !"
Now I initially write this without the 'le' in 'le lire' but this was corrected to 'le lire'. I am not sure why I cannot just say 'Je veux lire en française aussi !'