Complex sentence: For the first time in 1959 the pilot B.M. Vorobiev made heavy landing by AN-6 aircraft on the ice of the Sarez Lake, in 1960 the first flight on the route Stalinabad-Moscow was operated by IL-18.
Split into simpler sentences: For the first time in 1959, B.M. Vorobiev made heavy landing by AN-6 aircraft on the ice of the Sarez Lake. In 1960, the first flight on the route Stalinabad-Moscow was operated by IL-18.