Complex sentence: Believing her stories, Suleiman summoned his son and watched several mute slaves wrestle him to the ground and strangle him with a bowstring thus, creating room for Roxelena's son (Selim II) to become heir to the throne.
Split into simpler sentences: Believing her stories, Suleiman summoned his son and watched several mute slaves wrestle him to the ground and strangle him with a bowstring. Thus, creating room for Roxelena's son (Selim II) to be heir to the throne.