Complex sentence: Clumped distribution is the most common type of dispersion found in nature because animals need certain resources to survive, and when these resources become rare during certain parts of the year animals tend to "clump" together around these crucial resources.
Split into simpler sentences: Clumped distribution is the most common type of dispersion found in nature. Animals need certain resources to survive, and when these resources become rare during certain parts of the year animals tend to "clump" together around these crucial resources.