Ni tsurete につれて

Conjunction meaning: as (in consequence of some changes) 

1. After dictionary form of verb 

彼は年を取るにつれて温厚になった。 
Kare wa toshi o toru ni tsurete onkou ni natta. 
As he grew older, he became gentler. 

年がたつにつれて生活は楽になって来ました。 
Toshi ga tatsu ni tsurete seikatsu wa raku ni natte kimashita. 
As the years go by, my life has become (more and more) comfortable.