Complex sentence: The excavation base that was excluded from coal mining represents a small segment of a former littoral zone that has been visited over millennia between the Elster-and Saale ice age by humans and animals alike.
Split into simpler sentences: The excavation base that was excluded from coal mining represents a small segment of a former littoral zone. This zone has been visited over millennia, between the Elster-and Saale ice ages, by humans and animals alike.