Complex sentence: Wolfe had spent much time in Europe and was especially popular and at home in Germany, where he had many friends; however, in 1936, he witnessed discriminatory incidents towards Jewish people that upset him and changed his mind about the country.
Split into simpler sentences: Wolfe had spent much time in Europe and was especially popular and at home in Germany, where he had many friends. However, in 1936, he witnessed discriminatory incidents towards Jewish people that upset him and changed his mind about the country.