Complex sentence: Preliminary design of an aircraft to meet this requirement, designated Samolët 105 by Tupolev, was started in 1954, with the first prototype completed in December 1957, and making its maiden flight from Zhukovsky on 21 June 1958, flown by test pilot Yuri Alasheev.
Split into simpler sentences: Preliminary design of an aircraft to meet this requirement, designated Samolët 105 by Tupolev, was started in 1954, with the first prototype completed in December 1957. It made its maiden flight from Zhukovsky on 21 June 1958, flown by test pilot Yuri Alasheev.