文明が進めば進むほど人間は自然にあこがれる。

。

The more civilization advances, the more people long for nature.

Literal

Civilization [subject-が] advance-[if-ば]-advance-as-much-as, humans [topic-は] nature [target-に] long-for.

進めば進むほど is the classic ~ば~ほど construction: 'the more it advances, the more...' あこがれる (to long for, to yearn) takes に to mark the object of desire. A thought-provoking observation on the paradox of progress — the further civilization gets from nature, the more humans pine for it.