Complex sentence: Beatriz de la Cueva de Alvarado (1510-September 1541), was the Governor of the Spanish colony of Guatemala from July 1541 until September of that year.
Split into simpler sentences: Beatriz de la Cueva de Alvarado (1510-September 1541) was a Spanish offical. She served as the Governor of the Spanish colony of Guatemala from July 1541 until September of that year.