The user wants a translation to Japanese, only the translation, nothing else. The phrase: "Gwen Stefani's Brother Left No Doubt to Become An Animator for The Simpsons". Need to translate accurately. Potential translation: "グウェン・ステファニーの兄は、疑いなく『ザ・シンプソンズ』のアニメーターになることを決めた。" But "Left No Doubt" could be "疑いの余地がなかった" or "疑いなく". Maybe "疑いなく" is fine. Maybe "グウェン・ステファニーの兄は、疑いなく『ザ・シンプソンズ』のアニメーターになることを決めた。" Or "グウェン・ステファニーの兄は、疑いの余地なく『ザ・シンプソンズ』のアニメーターになった。" The phrase "Left No Doubt" could be "疑いの余地を残さず". But likely "疑いなく" works. Thus final answer: "グウェン・ステファニーの兄は、疑いなく『ザ・シンプソンズ』のアニメーターになることを決めた

We need to translate visible text content to Japanese, preserving HTML tags exactly. Must output only translation, nothing else. So we need to go through the HTML, replace text nodes. Let's parse:

 

The content is a non-breaking space? Actually it's a space. Should we keep as is? It's just whitespace. Probably keep as is (the space). No translation needed.

No Doubt was a 1986 American rock band from Anaheim, California. The band’s lineup for the majority of their career included vocalist Gwen Stefani, guitarist Tom Dumont, bassist Tony Kanal, and drummer Adrian Young. In live performances since the mid-1990s, they have been joined by trombonist and keyboardist Gabrial McNair and trumpeter and keyboardist Stephen Bradley. But did you know that Gwen Stefani’s brother was the band’s original keyboardist?

Translate that paragraph.

Eric Stefani, Gwen Stefani’s brother, was the keyboardist for the band No Doubt. He left the band to become a part of the hit TV animated series The Simpsons.