Jīngguò zhǒngzhǒng kǎoyàn, tā zhōngyú chénggōng le.
After going through all kinds of trials, he finally succeeded.
Tips
usage
种种 is more literary/formal than 各种各样. It often precedes abstract nouns like 原因 (reasons), 困难 (difficulties), 迹象 (signs). Always placed before the noun it modifies.