Complex sentence: These purely academic issues led the U.S. courts to describe cases where developing circumstances made any judgment ineffective as "moot"; the doctrine relates to ripeness, another judge made rule that holds that judges should not rule on cases based entirely on anticipated or hypothetical facts.
Split into simpler sentences: These purely academic issues led the U.S. courts to describe cases where developing circumstances made any judgment ineffective as "moot". The doctrine can be compared to the ripeness doctrine, another judge made rule that holds that judges should not rule on cases based entirely on anticipated disputes or hypothetical facts.