Complex sentence: Lavrov had a task to continuously analyse the situation in the coutry but also worked as a translator, personal secretary and assistant for Rafiq Nishonov, but was also assigned for the protocol gaining the diplomatic rank of an attaché.
Split into simpler sentences: Lavrov had a task to continuously analyse the situation in the country, but also worked as a translator, personal secretary and assistant for Rafiq Nishonov. In addition, he was also assigned for the protocol gaining the diplomatic rank of an attaché.