Breakdown of Я хочу полностью восстановиться, притом мне нужен отдых.
я
I
хотеть
to want
мне
to me
нужен
needed (short form)
Questions & Answers about Я хочу полностью восстановиться, притом мне нужен отдых.
Could I use причём instead of притом in this sentence?
Yes, they are often interchangeable, but there is a slight nuance. Притом usually adds a parallel thought, an extra justification, or an afterthought (besides, moreover). Причём tends to introduce a specific detail or condition directly related to the first clause. Here, since needing rest is an additional supporting point, притом works perfectly, but причём would also be perfectly understood.
Why is the second clause built as мне нужен отдых rather than using the word я?
In Russian, expressing need is most commonly done with a Dative construction. Мне is the Dative form of я (to me). Нужен is a short adjective meaning 'necessary' that agrees in gender and number with the Nominative subject that follows it, which is the masculine singular отдых. Literally, it means 'to me is necessary rest.' You could say я нуждаюсь в отдыхе, but that sounds much more formal.
Why is the perfective verb восстановиться used here?
The speaker is focusing on the final result of being completely healthy again. When you want to achieve a completed, finished state, you use the perfective aspect. The presence of the adverb полностью (completely) also strongly signals this focus on a finished result rather than an ongoing process.
Why does восстановиться have the reflexive -ся ending here?