I can't work more than three years according to the contract.
ーI can't work more than three years according to the contract.
「契約の関係で3年以上働くことができない」
例:
I can't work more than three years according to the contract. If I want to work more than three years, I have to wait three months at the end of my three-year contract, and then I can renew it for another three years.
「私は契約の関係で3年以上働くことができない。3年以上働きたいなら、3年の契約の終わりに3ヶ月待たなければいけない。そしたらまた3年間(契約を)更新することができる」
according to the contract で「契約によると」
to wait three months で「3ヶ月待つ」
three-year contract で「3年契約」
to renew で「更新する」
ご参考まで!