Complex sentence: After meeting, they decide to form a band, "Lemonade Mouth", that becomes popular, are played on the radio and eventually perform on Ri-Zing Star, becoming the most influential band in history.
Split into simpler sentences: After meeting, they decide to form a band, "Lemonade Mouth". The band becomes popular, is played on the radio and eventually performs on Ri-Zing Star, becoming the most influential band in history.