Question

Is this sentence fused, comma-spliced, or correct?

According to neurologist Wilder Penfield, the brain is the organ of destiny, holding secrets that will determine the future of the human race.

Answer 1

It is fine.
It has a participial phrase at the beginning According to neurologist ...
It has a subject nearby: Brain
It has a main predicate is
It has an predicate nominative organ and
another participial phrase holding secrets
Finally a subordinate clause that will determine ...

It is long, but it is not a fused or run on sentence.