Complex sentence: Thayer-Martin agar is a chocolate (heated blood agar) agar plate containing antibiotics (vancomycin, colistin, nystatin, and trimethoprim) and nutrients that facilitate the growth of "Neisseria" species while inhibiting the growth of contaminating bacteria and fungi.
Split into simpler sentences: Thayer-Martin agar is a chocolate agar plate (heated blood agar) containing nutrients and antimicrobials (vancomycin, colistin, nystatin, and trimethoprim). This agar preparation facilitates the growth of "Neisseria" species while inhibiting the growth of contaminating bacteria and fungi.