反対したが、それでも

although [someone] objected, even so

→ 反対
phrase Rare #38,241
although [someone] objected, even so Expresses that something happened despite someone's opposition. The subject of 反対した is understood from context.
JA: 両親は反対したが、それでも彼は留学した。
EN: Although his parents objected, he still studied abroad.

みんなが反対したが、それでもメアリージョン結婚した

Everyone objected, but Mary and John got married anyway.

皆は反対したが、それでもやはり彼らは結婚した

Everyone opposed it, but they got married anyway.

誰もが反対したが、それでもサリーボブ結婚した

Everyone was opposed, but Sally and Bob got married anyway.