Complex sentence: The message of this poem seems straightforward and was duplicated by many other "graveyard" poems of the late eighteenth centuries, so what makes it one of the most famous in the English language cannot be the poem's message, according to Brooks.
Split into simpler sentences: The message of this poem seems straightforward and was duplicated by many other "graveyard" poems of the late eighteenth century. Therefore, what makes it one of the most famous in the English language cannot be the poem's message, according to Brooks.