For a young persons playing violin and virtual youngsters in an orchestra - I use the term not as a negative but in awe - nearly any piece by Prokofiev is extremely difficult. The music is so tight and disjointed - yes a contradiction - that individual parts don't seem to make any sense. But they do. It is like 30 people in a room talking and all of a sudden, with each person uttering just one word, there is a full sentence and another and then a paragraph and then a short story - but each person contributes just a word at a time.
About 8-9 minutes in you'll get the idea. If it doesn't make you cry then you missed it.