と[言「い」]うのは => Means, is N3
Information, Report
というのは => because N2
~ものとおもう => Believe~ N1
Speculation
とはいうものの => having said that; be that as it may N2
Things do not match the prediction
... というのは => It means... N3
Explain
というものは...だ => something like; something called ~ N3
Explain
~のは…ぐらいのものだ => only (emphasis) N1
Limit
...というのも => The reason is N2
Cause, reason
... というもの => something like; something called ~ N3
Command, definition
というのは => this means; the meaning of … N2
Explain
というものではない => Not sure, not means N2
Information, Report
~てからというもの      => ever since ~ N1