A long time ago, an advanced civilisation flourished here and these are the ruins of the pyramids they built.
These are the remains of pyramids that were built here a long time ago by an advanced civilisation.
「昔この地には高度な文明が栄えていて、これはその遺跡です」＝ A long time ago, an advanced civilisation flourished here and these are the ruins of the pyramids they built. / These are the remains of pyramids that were built here a long time ago by an advanced civilisation.
ボキャブラリー
a long time ago ＝ 昔
advanced civilisation ＝ 高度な文明
flourished ＝ 栄えていた
ruins ＝ 遺跡
pyramids ＝ ピラミッド
built ＝ 建てた
イギリス 
