Complex sentence: J. Sussman, Inc. was founded by Isadore Sussman in 1906 who learned the iron working trade in Poland and then moved to England where he learned to make windows.
Split into simpler sentences: J. Sussman, Inc. was founded by Isadore Sussman in 1906. Isadore learned the iron working trade in Poland and then moved to England where he learned to make windows.