original: Two tubes of amphetamines and a further empty tube were found in the rear pocket of his racing jersey.
simplifications: Two tubes with amphetamines were found in the pocket of his racing shirt. Two full and one empty tube of amphetamines were found in the pocket of his jersey. Two tubes of amphetamines and one empty tube were found in his racing jersey. Three tubes were found in the back pocket of his racing jersey.  Two contained amphetamines, and the third was empty. Two tubes of amphetamines and another empty tube were found. They were in the rear pocket of his racing jersey. Two tubes of drugs and a third empty tube were found in his back pocket. Two tubes of amphetamines and one empty tube were found in the back pocket of his racing jersey. Two tubes of amphetamines and one empty tube were found in his racing jersey. 2 amphetamine tubes and yet another empty tube were found in his racing jersey's rear pocket. Two tubes of amphetamines and an empty tube were found in the back pocket of his racing jersey.