Complex sentence: The one transistor (T1 or T3) is cut-off and the other (T3 or T1) is in active linear region acting as a common-emitter stage with emitter degeneration that takes all the current, starving the other cut-off transistor.
Split into simpler sentences: The one transistor (T1 or T3) is cut-off and the other (T3 or T1) is in active linear region acting as a common-emitter stage with emitter degeneration. It takes all the current, starving the other cut-off transistor.