Complex sentence: Encouraged by Edmund Wilson, who published Jarrell's criticism in "The New Republic", Jarrell quickly became a fiercely humorous critic of fellow poets, but in the post-war period, his criticism began to change, showing a more positive emphasis.
Split into simpler sentences: Encouraged by Edmund Wilson, who published Jarrell's criticism in "The New Republic", Jarrell quickly became a fiercely humorous critic of fellow poets. In the post-war period, his criticism began to change, showing a more positive emphasis.