Complex sentence: Martin de Estete began the design of the streets of Trujillo by order of Diego de Almagro in ends of year 1534, so he designed the structure and dimensions of the Plaza de Armas.
Split into simpler sentences: Martin de Estete began the design of the streets of Trujillo by order of Diego de Almagro in ends of year 1534. So who designed the structure and dimensions of the Plaza de Armas.