Complex sentence: When Thomas returns to Washington D.C., he meets with President Blair, Monique and his sister Kara at Genetrix Labs to check on the antivirus progress, but the only feasible cure is through his blood.
Split into simpler sentences: When Thomas returns to Washington D.C. he meets with President Blair, Monique and his sister Kara at Genetrix Labs to check on the progress of the antivirus. They inform him that the only feasible cure is through his blood.