For those who have been here before, you can relive from a view of the old convent from across the lawns. （这一段曾经给你解释过）
For those who have been here before 对那些在这之前一直住在这里的人来说.
for —— 对…来说
those who —— 那些…的人（who 引导定语从句）
before —— 说话前的那段时间
you can relive from a view of the old convent from across the lawns. 你可以从草坪的那边在一览旧修道院的景色中获得新生.
relive from —— 从…中苏醒/复活
a view of the old convent —— 那个旧/老式女修道院的景色/风景
across the lawns —— 在草地/草坪的对过,越过草坪,在草坪的那边（across 是介词）
from across the lawns 从草坪的那边/对过 （from across 是复合介词）