Hello Alexander, To answer your question, the additional "to" is unnecessary in this sentence, since it is preceded by "will be able to" at the start of the clause. I have rewritten the sentence below with a couple of other small amendments. The last item in the list, "plenty of other things", needs its own verb. I would suggest either "enjoy", or "do", but the choice is yours! Students that travel abroad have more opportunities than those who do not. They will be able to learn a new language, make new friends, create and expand their networks, and enjoy/do plenty of other things besides. Hope this helps. All the best, Shae