What the subordinating clause?

if you were paying attention, you can figure this out.

However, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. what would be the best way to revise this sentence for greater clarity? a) however, the fact that columbus left spain thousands of years after people settled what would become the united states never dawned on me. b) it never dawned on me, however, the idea of real-life people living in what would become the united states for thousands of years before columbus ever left spain. c) however, the fact that people were already living in what would become the united states for thousands of years before columbus ever left spain never dawned on me. d) however, the idea never dawned on me that long before columbus ever left spain, real-life people lived for thousands of years in what would become the united states.

Throughout the memoir, the prisoners are made equal in the way they are treated, and again, eliezer sees their equality in another way. how does he describe the equality?

Power going out story i need with a plot and the starting point is you wake up late, the power is out, and yeah. plz try to make it non complex since i have to write it in spanish