Complex sentence: Danny also accidentally phased through Mr. Lancer's briefcase where Lancer was keeping the C.A.T. answer booklet, and after finding the booklet stuck to his back, believing this is the answer to all of his studying problems.
Split into simpler sentences: Danny also accidentally phased through Mr. Lancer's briefcase where Lancer was keeping the C.A.T. answer booklet. After finding the booklet stuck to his back, believing this is the answer to all of his studying problems.