Learn German: Ich brauche das Stipendium, um erfolgreich zu studieren. - I need the scholarship in order to study successfully.

um ... zu translates to "in order to". The word um starts the new clause, and zu goes right in front of the infinitive verb at the very end of the sentence (zu studieren). Any extra information, like how you are studying (erfolgreich), is sandwiched between them.

Why is there no ich in the second part of the sentence?

An um ... zu phrase never includes a subject. You can only use this structure when the person doing the action in the main sentence is the exact same person doing the action in the second part. Since ich need the scholarship, it is automatically understood that I am also the one studying.

Could I use lernen instead of studieren here?

Probably not in this context. In German, studieren specifically means being enrolled at a university or majoring in a subject. Since the speaker is talking about das Stipendium (the scholarship), they mean university-level studies. lernen is used for the general act of studying for a test, reviewing notes, or acquiring a skill like a language.

Is the comma before um strictly necessary?

Yes, it is! While we often don't use a comma before "in order to" in English, German punctuation rules require you to always separate an um ... zu clause from the main sentence with a comma.