Conversation so far:
Did Vaslov Nijinsky go to dancing school?
Vaslav Nijinsky joined the Imperial Ballet School. His dancing prevented his expulsion for poor results. This laxity was compounded by Nijinsky's frequently being away from classrooms for rehearsals.

Question: What was he rehearsing?
Self-contained rewrite: What was Vaslav Nijinsky rehearsing during his school years?