Complex sentence: The female lays up to a dozen eggs in a damp crevice and guards them until they hatch in six months to a year; during this time she does not normally eat, though it has been known for females to eat a proportion of their eggs.
Split into simpler sentences: The female lays up to a dozen eggs in a damp crevice and guards them until they hatch in six months to a year. During this time she does not normally eat, though it has been known for females to eat a proportion of their eggs.