Complex sentence: The area began as lands belonging to two countesses in the colonial period, but the area the 19th century and early 20th century, the process of subdividing this land was already begun although Colonia Condesa proper would not be established until the very early 20th century.
Split into simpler sentences: The area began as lands belonging to two countesses in the colonial period. By the 19th century and early 20th century, the process of subdividing this land was already begun although Colonia Condesa proper would not be established until the very early 20th century.