Complex sentence: A running gag is that Hooterville is so remote that the only way to get there is by parachute; a plot hole shows however that Hooterville is connected on a railroad and has a nearby airport in Pixley.
Split into simpler sentences: A running gag is that Hooterville is so remote that the only way to get there is by parachute. However, a plot hole shows that Hooterville is connected on a railroad and has a nearby airport in Pixley.