Complex sentence: The original backstory for Barney's Bowlerama was that it was owned by Barney Gumble, but it was switched to Barney just being an employee, as the writers could not imagine Barney owning anything.
Split into simpler sentences: The original backstory for Barney's Bowlerama was that it was owned by Barney Gumble. Over time it changed to Barney just being an employee, as the writers could not imagine Barney owning anything.