Complex sentence: A running joke throughout the series is that Hank and Peggy would have more kids if it weren't for Hank's "narrow urethra", a topic Hank is sensitive about and often becomes annoyed about if brought up to people outside the immediate family.
Split into simpler sentences: A running joke throughout the series is that they would have more kids if it wasn't for Hank's "narrow urethra". A topic Hank is sensitive about and often becomes annoyed about if brought up to people outside of the immediate family.