Cut or tear cooled cake into 1-inch pieces. Arrange half of pieces in 3 1/2-quart glass serving bowl, cutting pieces to fit shape of bowl. Drizzle 1/2 cup of the chocolate syrup over cake; spread with 2 cups of the pudding. Reserve 1/2 cup orange segments for garnish; arrange remaining orange segments over pudding. Add remaining cake pieces. Top with remaining chocolate syrup, remaining pudding and the whipped topping. Cover; refrigerate at least 2 hours until chilled.