Jīngyàn fēngfù de tā zuòchū zhè zhǒng pànduàn bùzúwéiguài.
Given his deep experience, him reaching this judgement is hardly surprising.
Tips
usage
Typically sits at the end of a sentence as a comment: [situation]+也/就不足为怪. Interchangeable with 不足为奇, though 不足为怪 leans slightly more toward 'no cause for alarm.'