Complex sentence: He was declared "King of Kurdistan" and claimed to be the ruler of all Kurds, but the opinion of Mahmud among Kurds was mixed because he was becoming too powerful and ambitious for some.
Split into simpler sentences: He was declared the "King of Kurdistan" and claimed to be the ruler of all Kurds. Yet the opinion of Mahmud among Kurds was mixed because he was becoming too powerful and ambitious for some.