Complex sentence: Some political leaders, such as Pedro Albizu Campos, who led the Puerto Rican Nationalist Party, demanded change in relations with the United States and organized a protest at the university in 1935, in which four were killed by police.
Split into simpler sentences: Some political leaders, such as Pedro Albizu Campos, who led the Puerto Rican Nationalist Party, demanded change in relations with the United States. He organized a protest at the university in 1935, in which four were killed by police.