Complex sentence: Born to a family of a wealthy Czech architect Otto Kohn of Jewish origin, he emigrated with his family to Ecuador in 1939, and to the United States in 1945, where he attended Brooklyn Technical High School.
Split into simpler sentences: Born to a family of a wealthy Czech architect Otto Kohn of Jewish origin. He emigrated with his family to Ecuador in 1939, and to the United States in 1945, where he attended Brooklyn Technical High School.