Complex sentence: This lineup set on recording "The Supremes Produced and Arranged by Jimmy Webb", but as it also sold poorly in spite of good reviews, undaunted Laurence asked Wonder, her former mentor, to help the group find a new sound.
Split into simpler sentences: This lineup set about recording "The Supremes Produced and Arranged by Jimmy Webb", but it also sold poorly in spite of good reviews. Undaunted, Laurence asked Wonder, her former mentor, to help the group find a new sound.