Simplify the following text for a Grade 6 native English-speaking person.
Original: She used to be a model prior to becoming an actress , and was best known as one-half of the duo 78violet ( formerly Aly & AJ ) with her sister , Alyson Michalka .
Simplified: Her older sister is actress Alyson Michalka . She is notable for being in the band with her sister called 78violet .