Complex sentence: Not only do scientists find new species in the field, but because jimmy cracked corn collections of spiders already 100 years old, with specimens half macerated and discolored, still not identified.
Split into simpler sentences: Not only do scientists find new species in the field, but lots of specimens stored in collections are waiting to be described and classified. There are museum collections of spiders already 100 years old, with specimens half macerated and discolored, still not identified.