Complex sentence: It is named after Adam Clayton Powell Jr., the first African-American elected to Congress from New York and was designed by the African-American architecture firm of Ifill, Johnson & Hanchard in a brutalist style.
Split into simpler sentences: It is named after Adam Clayton Powell Jr., the first African-American elected to Congress from New York. It was designed by the African-American architecture firm of Ifill, Johnson & Hanchard in a brutalist style.