Essayist: Since ancient times humans have relied on myths to try to explain our place in the cosmos.
Conclusion (So)
Science falls short of complete truth.
Evidence (amply demonstrated by)
You can measure the truth of science (or myth) based on how much it helps humans cope with the human condition.
Science is responsible, to a considerable degree, for the breakdown of society's key institutions. (i.e. science isn't completely helping us cope with the human condition?)
Evaluate
This is a super weird argument, designed to obfuscate as much as possible where the actual conclusion is. On Main Conclusion / Role, we know that 80% of the time it's an upside down argument, with the conclusion appearing earlier than the evidence.
Because we read with an eager ear for early conclusions, we might have reasonably suspected that , because the following claim sounds like support (it says something that applies to both science and myth).
But the final sentence screams out Conclusion + Evidence, because it's structured,
Goal
Look for a restatement of "science falls short of complete truth". It's supported by the end of the final sentence and by the third sentence.