Complex sentence: After a tenuous truce is declared, one Four oversees the transfer of resurrection data from the Final Five to the Colony Hybrids, but when the truce is broken when Galen Tyrol murders Tory Foster the Fours in the CIC all die in the ensuing firefight.
Split into simpler sentences: After a tenuous truce is declared, one Four oversees the transfer of resurrection data from the Final Five to the Colony Hybrids, but when the truce is broken when Galen Tyrol murders Tory Foster. The Fours in the CIC all die in the ensuing firefight.