In affirmatives, except when preceded by a preposition¹, pronouns always come before the verb in French.

In “Jean va apporter des pralines à Marie”, “des pralines” is a direct object, “à Marie” is an indirect object, and both complement the verb apporter. Similar sentences that use pronouns include the following:

• Jean va en apporter à Marie.
• Jean va lui apporter des pralines.
• Jean va lui en apporter.

The same rules apply to verbs in the infinitive and to conjugated ones.

Here is a more complex sentence:

Jean lui promet de lui en apporter.

In this sentence, the first lui stands for Marie as indirect object of promettre, the second lui also stands for Marie but as indirect object of apporter, and en stands for the pralines as direct object of apporter.

Also, the order of pronouns is fixed. Cf. The order of direct and indirect object pronouns.

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^{1. “Jean cueille ces fleurs pour Marie” becomes “Jean cueille ces fleurs pour elle”.}

Knowing that the addressee is Marie, and the gift a box of sugared almonds, you may say :

“Jean va lui en apporter”, or :

“Jean va en apporter pour elle”.

But never end a sentence with “en”.

The construction of “Jean lui en conseille”, when now you are speaking of books, is exactly the same.

You may sometimes change the order :

“J’en lui conseille” (but “Jean en” would be terrible for the ear).

“Louis en lui conseille” is better than “Louis lui en conseille” (for the same reason).

Other examples : “J’en lui sais gré”, “J’en vous donne des exemples”, rather classical but not obsolete, when you wish to insist on the indirect object and its proximity.

“Jean lui promet de lui en apporter” is not incorrect, but very inelegant, and suggests that the two “lui” are not standing for the same person. “Jean lui promet d’en apporter” is enough to guess that it’s not for somebody else.