Question

before the advent of television and internet when radio was popular, even the advertisement of some commercial establishment in Mettupalayam used to be in kannada .
Which is the main clause and which is the subordinate clause

Answer 1

main Clause is before the advent of television and internet when radio was popular and the subordinate clause is even the advertisement of some commercial establishment in Mettupalayam used to be in Kannada

Answer 2

Where's the answer of my question