Complex sentence: A copper-plate inscription, now at the Government Museum Chennai, calls him Madurai Konda (conqueror of Madurai), indicating there were campaigns against the Pandyas and Illam in the South.
Split into simpler sentences: A copper-plate inscription stores at the Government museum, Chennai calls him Madurai Konda (conqueror of Madurai). Therefore, it is safe to assume that there were campaigns against the Pandyas and Illam in the South.