Complex sentence: A running joke for years in the title was that the landlord was initially eager to rent out to a superhero team for the publicity and prestige, however, he soon regretted his decision, as the building became a constant target for numerous attacks by supervillains.
Split into simpler sentences: A running joke for years in the title was that the landlord, who was initially eager to rent out to a superhero team for the publicity and prestige. However, the landlord soon regretted his decision, as the building became a constant target for numerous attacks by supervillains.