Complex sentence: Jax doesn't believe Cage's story on account of a distress signal from Sonya pinpointed to where they found Cage and, more precisely, because he doesn't believe Sonya would ever fight alongside Kano, even if Cage says she had no choice.
Split into simpler sentences: Jax doesn't believe Cage's story on account of a distress signal from Sonya pinpointed to where they found Cage. And, more precisely, because he doesn't believe Sonya would ever fight alongside Kano, even if, as Cage says, she had no choice.