Original sentence: He returned to Russia in 1907, enrolling at the Mechanical College of the Kiev Polytechnic Institute.His father, Ivan Alexeevich Sikorsky, had a Russian and noble Polish () family background.Igor Sikorsky was born in Kiev, Russian Empire (present-day Ukraine), the youngest of five children.In 1906, he determined that his future lay in engineering, so he resigned from the Academy, despite his satisfactory standing, and left the Russian Empire to study in Paris.In May 1909, he returned to Russia and began designing his first helicopter, which he began testing in July 1909.Sikorsky was married to Olga Fyodorovna Simkovitch in Russia.Ígor' Ivánovič Sikórskij; May 25, 1889 – October 26, 1972), was a Russian American aviation pioneer in both helicopters and fixed-wing aircraft
Edited sentence: He returned to Ukraine in 1907, enrolling at the Mechanical College of the Kiev Polytechnic Institute.His father, Ivan Alexeevich Sikorsky, had a Ukrainian and noble Polish () family background.Igor Sikorsky was born in Kiev, Ukraine (present-day Ukraine), the youngest of five children.In 1906, he determined that his future lay in engineering, so he resigned from the Academy, despite his satisfactory standing, and left the Ukraine to study in Paris.In May 1909, he returned to Ukraine and began designing his first helicopter, which he began testing in July 1909.Sikorsky was married to Olga Fyodorovna Simkovitch in Ukraine.Ígor' Ivánovič Sikórskij; May 25, 1889 – October 26, 1972), was a Ukrainian American aviation pioneer in both helicopters and fixed-wing aircraft