The Age of Exploration: Chapter 9, Exercise 2 — Possible Solution
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QUALIFICATION
About 12.75 million is scholars' estimate of Africans loaded onto slave ships
for the Americas, not the number enslaved by the trade: the source says up to
2 million died on the voyages, and a further 8 million were enslaved but
remained on the continent.

REWRITE
"Scholars estimate about 12.75 million Africans were loaded onto slave ships
for the Americas, with up to 2 million dying during the voyages."

CAUTION
I did not find how the figures are derived.