(1) In general Title I of the Employee Retirement Income Security Act of 1974 ( 29 U.S.C. 1001 et seq.) is amended by adding at the end the following: 8 Composite Plans and Legacy Plans 801. Composite plan defined (a) In general For purposes of this Act, the term composite plan means a pension plan— (1) which is a multiemployer plan that is neither a defined benefit plan nor a defined contribution plan