Complex sentence: Sandino was involved with Seventh Day Adventists, spiritist gurus and anti-imperialist, anarchist and communist revolutionaries, embracing the anti-clericalism of Mexico's revolution and the ideology of "indigenismo," which glorified the indigenous heritage of Latin America.
Split into simpler sentences: Sandino was involved with Seventh Day Adventists, spiritist gurus and anti-imperialist, anarchist and communist revolutionaries. He embraced the anti-clericalism of Mexico's revolution and the ideology of "indigenismo," which glorified the indigenous heritage of Latin America.