Complex sentence: In Italy, he met Walter White, executive secretary of the NAACP, and after the war, White gave Harrington the job of creating the organization's public relations department, where he became a visible and outspoken advocate for civil rights.
Split into simpler sentences: In Italy, he met Walter White, executive secretary of the NAACP. After the war, White hired Harrington to develop the organization's public relations department, where he became a visible and outspoken advocate for civil rights.