<prompt> Translate the following text to EnglishZarco alitawala sehemu ya magharibi ya kisiwa cha Madeira, huku Tristo Vaz Teixeira, aliyekuwa na meli ya Ureno, akitawala sehemu ya mashariki kutoka Machico.  <response>: Zarco ruled the western half of Madeira, while his fellow Portuguese captain and navigator, Tristao Vaz Teixeira, governed over the eastern half from Machico. 