Complex sentence: Colonel Tigh has been held captive in the Cylon detention facility for an unspecified, but extended, period of time, and is released to the custody of Ellen Tigh after her sexual liaison with Cylon Brother Cavil earns her husband's freedom.
Split into simpler sentences: Colonel Tigh has been held captive in the Cylon detention facility for an unspecified, but extended, period of time. He is released to the custody of Ellen Tigh after her sexual liaison with Cylon Brother Cavil earns her husband's freedom.