Conversation so far:
How did Sergei get started in his career?
After graduation, Sergei Korolev worked with some of the best Soviet designers at the 4th Experimental Section aircraft design bureau OPO-4 headed by Paul Aimé Richard

Question: Where did this lead him?
Self-contained rewrite: Where did working with some of the best Soviet designers at the 4th Experimental Section aircraft design bureau OPO-4 headed by Paul Aimé Richardlead Sergei Korolev?