Complex sentence: He immediately recognizes her as his long-lost daughter Hamato Miwa, but Karai reveals she believes Splinter killed her mother Tang Shen, a lie fed to her from birth by Shredder.
Split into simpler sentences: He immediately recognizes her as his long-lost daughter Miwa. But Karai reveals she believes Splinter killed her mother Tang Shen, a lie fed to her from birth by Shredder.