Complex sentence: Executive producer Sam Simon and writers Al Jean and Mike Reiss came up with the idea for the episode and although Meyer was credited with writing the episode, Jean and Reiss re-wrote and polished the script.
Split into simpler sentences: Executive producer Sam Simon and writers Al Jean and Mike Reiss came up with the idea for the episode. Although Meyer was credited with writing the episode, Jean and Reiss re-wrote and polished the script.