Complex sentence: Willoughby is an animated cartoon fictional character in the Warner Bros. "Looney Tunes" series of cartoons, he was created by Tex Avery for the 1941 cartoon, "The Heckling Hare".
Split into simpler sentences: Willoughby is an animated cartoon fictional character in the Warner Bros. "Looney Tunes" series of cartoons. Willoughby was created by Tex Avery for the 1941 cartoon, "The Heckling Hare".