Original sentence: According to Champakalakshmi, there were at least three stages in the evolution of Thevaram: first was the composition of the hymns by the Tevaram trio, then these were adopted in temple rituals and festivals by patikam singers, and thereafter came a conscious 11th-century structuring of these poems into a canonized text.The last stage was assisted by the pontiffs of the mathas (monasteries) who incorporated the hymns into the Shaiva Siddhanta canon in the 13th century.They lived between the 6th and 8th-century CE states Peterson, while Champakalakshmi dates them in the 7th to 9th-century
Edited sentence: They lived between the 6th and 8th centuries CE.Three stages have been identified in the evolution of Thevaram: first, the mark of Shiva as the supreme deity during the 7th–9th century; second, the Chola kings initiating the compilation of all the hymns and the installing of the images of the three saint poets during the 10th to the 11th century; and lastly, the restructuring done by the pontiffs of the mathas who incorporated the hymns into the Shaiva Siddhanta canon in the 13th century