Original sentence: It was already thought that the Earth's lifespan was far longer than that suggested by literal readings of the Bible (an age of 75,000 years had been suggested as early as 1779, as against the 6,000 years proposed by Archbishop James Ussher's famous chronology)
Edited sentence: It was already clear that the Earth's lifespan was far longer than that suggested by literal readings of the Bible (an age of 75,000 years had been suggested as early as 1779, as against the 6,000 years proposed by Archbishop James Ussher's famous chronology)