Complex sentence: Throughout the season, his quest to get the book published becomes a running gag, and, although Elaine is portrayed as disliking the idea, Mr. Lippman, Elaine's boss, likes it.
Split into simpler sentences: Throughout the season, his quest to get the book published becomes a running gag. Although Elaine is shown as disliking the idea, Mr. Lippman, Elaine's boss, likes it.