Complex sentence: Grooming is extremely important not only to clean themselves but also to ensure ectoparasite control, fleas tend to be the most common ectoparasite of cats and some studies allude to indirect evidence that grooming in cats is effective in removing fleas.
Split into simpler sentences: Grooming is extremely important not only to clean themselves but also to ensure ectoparasite control. Fleas tend to be the most common ectoparasite of cats and some studies allude to indirect evidence that grooming in cats is effective in removing fleas.