Complex sentence: Although both the "P. rebeli" and "P. alcon" parasitize the "M. scabrinodis", they do so at different rates; the "P. alcon" is far more likely to parasitize it than the "P. rebeli".
Split into simpler sentences: Although both the "P. rebeli" and "P. alcon" parasitize the "Myrmica scabrinodis", they do so at different rates. The "P. alcon" is far more likely to parasitize "M. scabrinodis" than the "P. rebeli".