Question

what does this sentence structure emphasize?
millions of riddles can be solved instantly by simon cowells new invention.
the number of riddles solved
the tool that solves the riddles

Explanation:

This is a passive sentence, where the fronted subject "Millions of riddles" places focus on the quantity of riddles that can be solved, rather than the tool (Simon Cowell's invention) which is positioned at the end as the agent introduced by "by".

Answer:

The number of riddles solved