Complex sentence: He is known as the voices of Numbuh 1 and Numbuh 2 in the animated series', for voicing Humphrey in' and he also did the voice of Eugene in "Hey Arnold!".
Split into simpler sentences: He is known as the voices of Numbuh 1 and Numbuh 2 in the animated series', and for voicing Humphrey in'. He also did the voice of Eugene in "Hey Arnold!".