Complex sentence: Seymour's original clock was erected while the national debt remained under $3 trillion but was rising, but it was temporarily switched off from 2000 to 2002 due to the debt actually falling.
Split into simpler sentences: Seymour's original clock was erected while the national debt remained under $3 trillion but was rising. It was temporarily switched off from 2000 to 2002 due to the debt actually falling.