Complex sentence: Pinta is a human skin disease endemic to Mexico, Central America, and South America caused by infection with a spirochete, "Treponema pallidum carateum", which is morphologically and serologically indistinguishable from the organism that causes syphilis.
Split into simpler sentences: Pinta is a human skin disease endemic to Mexico, Central America, and South America. It is caused by infection with a spirochete, "Treponema pallidum carateum", which is morphologically and serologically indistinguishable from the organism that causes syphilis.