Complex sentence: Sinanpaşaoğlu Mehmed Pasha who had been married to Piyale Pasha and Gevherhan Sultan's daughter in November 1598, was sent to quell the Jelali rebellions in Anatolia, proved ineffective, and conducted himself so inappropriately as to arouse suspicions that he had turned rebel himself.
Split into simpler sentences: Sinanpaşaoğlu Mehmed Pasha who had been married to Piyale Pasha and Gevherhan Sultan's daughter in November 1598, was sent to quell the Jelali rebellions in Anatolia. However, he proved to be ineffective, and conducted himself so inappropriately as to arouse suspicions that he had turned rebel himself.