Complex sentence: Intent on amassing a base of power in Hungarian right wing politics, Imrédy began to suppress political rivals, so the increasingly influential Arrow Cross Party was harassed, and eventually banned by Imrédy's administration.
Split into simpler sentences: Intent on amassing a base of power in Hungarian right wing politics, Imrédy began to suppress political rivals. The increasingly influential Arrow Cross Party was harassed and eventually banned by Imrédy's administration.