it will be shown that the two "extra verses" those that only appeared in the copies of poitiers, romania and pennsylvania respectively, have just as good a claim to be included in la vie de l'homme as the 22 other verses have.

This is all lower case. Can you fix that?
It will be shown that the two "extra verses" those that only appeared in the copies of Poitiers, Romania and Pennsylvania respectively, have just as good a claim to be included in La Vie de l'Homme as the 22 other verses have.