'which were adopted' is correct and usable in written English.
You can use this phrase to refer back to something mentioned previously in the sentence or in the context of the discussion. For example: The students created several proposals for the new budget, which were adopted by the school board.
Grimm's Fairy Tales comprises some 200 stories, most of which were adopted from oral sources.
During the conference, Mobutu supported Lumumba's proposals (which were adopted) for a strongly centralized state for the independent Congo.
But researchers say that private finance alone is not likely to meet all the sustainable development goals (SDGs), which were adopted last year and expand on the MDGs.
The proposals, which were adopted by the European commission in Brussels, are designed to outlaw sexual discrimination in the provision of goods and services.
It tightens provisions in the federal sentencing guidelines, which were adopted by Congress in 1987 to make sentences in federal criminal cases more uniform.
Other landmarks achieved under Pifer's leadership include recommendations from the Carnegie Commission on Educational Television, which were adopted in the Public Broadcasting Act of 1968.
The house was home to Samuel Huntington, the first person to serve as president of Congress under the Articles of Confederation, which were adopted in 1781.
Twice, Bob Nichols, a spokesman for the election supervisor, tried to explain the rules of the manual recount, which were adopted in 1990.
You have defined a host of new offenses like stalking, voyeurism, and disrobing a woman, many of which were adopted by the government this weekend.
These rules formed the basis of the International Regulations for Preventing Collisions at Sea, which were adopted by nearly all maritime nations after a conference held in 1889.
The Lyme Land Conservation Trust was not pleased, and in 2009, it sued to enforce the restrictions, which were adopted in the 1980s.
