Complex sentence: For "H. pomatia", the soil should be at least 3 inches deep to keep out pests such as ants, earwigs, millipedes, etc. Dry soil is not suitable for the preparation of a nest, nor is soil that is too heavy.
Split into simpler sentences: For "H. pomatia", the soil should be at least 3 inches deep. Keep out pests such as ants, earwigs, millipedes, etc. Dry soil is not suitable for the preparation of a nest, nor is soil that is too heavy.