Complex sentence: The religious sect he organized, called Santa Iglesia or Holy Church, borrowed much of its organization and terminology from the Catholic Church, although the creed of the Santa Iglesia had strongly anti-Spanish, anti-Catholic overtones.
Split into simpler sentences: The religious sect he organized, called Santa Iglesia or Holy Church borrowed much of its organization and terminology from the Catholic Church. The creed of the Santa Iglesia had strongly anti-Spanish, anti-Catholic overtones.