A rare alignment of the sun, the full moon and Earth, plus the closest lunar approach to Earth since AD 796, caused extremely high tides on January 4, 1912. causedの前までが、主語だと思うのですが、approachが原型動詞でも大丈夫なのはどうしてでしょうか？ 分詞や関係代名詞なので繋ぐイメージなのですが、、、

A rare alignment of the sun, the full moon and Earth, plus the closest lunar approach to Earth since AD 796, caused extremely high tides on January 4, 1912. ですね。 ＜文の構造＞ A rare alignment of the sun, the full moon and Earth, plus the closest lunar approach to Earth since AD 796, ＜主語＞ caused ＜述語動詞＞ extremely high tides ＜目的語＞ on January 4, 1912. ＜時の副詞句＞ この approach は名詞です。 考え方は、 the closest lunar「lunar が形容詞なので次は名詞の可能性」 to Earth since AD 796「前置詞句の形容詞用法だろう」