In this task, we ask you to rewrite a sentence in simple English without changing its general meaning. Essentially, you want to make the sentence easier to read by using simpler words, utilizing more straightforward sentence structures, and omitting non-essential information etc.
Q: Emerson , Lake & Palmer were commercially successful through much of the 1970s , becoming one of the best-known progressive rock groups of the era .
A: 
Emerson , Lake & Palmer were successful through much of the 1970s .