Complex sentence: Newsmax has a sizable stable of news correspondents and editorialists, including Ronald Kessler, Newsmax's chief Washington correspondent, who worked for "The Washington Post" and "The Wall Street Journal".
Split into simpler sentences: Newsmax has a sizable stable of news correspondents and editorialists. Among them is Ronald Kessler, Newsmax's chief Washington correspondent, who worked for "The Washington Post" and "The Wall Street Journal".