Independent component analysis have revealed that individuals with the inattentive type of ADHD have significantly more independent components are required to describe the variance of this data.
Independent component analysis have revealed that individuals with the inattentive type of ADHD have significantly more independent components that are required to describe the variance of this data.
The subject of "are"
are の主語
individuals with the inattentive type of ADHD have significantly more independent components are required to describe the variance of this data.のままで正しい英語ではないです。
componentsの後にくる文章を形容詞のような表現にすると自然に聞こえるようになります。
→components that are required to describe the variance of this data
ご参考になれば幸いです!