。
You can see a house through the trees.
Literal
Grove [possessive-の] interval [at-に] house [subject-が] is-visible.
木立 ('grove, copse') is a poetic compound noun made of 木 ('tree') + 立つ ('to stand') — literally 'the standing of trees,' a small stand of trees. の間 ('the gap of') turns it into 'between/among the trees.' 見える ('to be visible / can be seen') is the standard intransitive 'can see' verb, taking the visible object as its subject with が.