Simplify the following text for a Grade 11 native English-speaking person.
Original: Darwin presents supporting facts drawn from many disciplines , showing that his theory could explain a myriad of observations from many fields of natural history that were inexplicable under the alternate concept that species had been individually created .
Simplified: Darwin presents supporting facts drawn from many disciplines . The idea was to show that his theory could explain a myriad of observations from many fields of natural history that were inexplicable if species had been individually created .