Complex sentence: In the United States, it is manufactured by Roche and distributed by the Center for Disease Control on a basis as an investigational drug for the treatment of metronidazole-resistant amoebiasis.
Split into simpler sentences: In the United States, it is manufactured by Roche. It is distributed by the Center for Disease Control on a basis as an investigational drug for the treatment of metronidazole-resistant amoebiasis.