Complex sentence: Usama was known as a man who meddled in the business of others, rather than commanding any power of his own; but to contemporary and later medieval Muslims, he was best remembered for his poetry and his poetry anthologies.
Split into simpler sentences: Usama was known for meddling in the business of others, rather than commanding any power of his own. To contemporary and later medieval Muslims, however, he was best remembered for his poetry and his poetry anthologies.