The rise of anti-happy art almost exactly tracks the emergence of mass media, and with it, a commercial culture in which happiness is not just an ideal but an ideology.

　　【析句】it 指代the rise;in which引導的從句修飾commercial culture 。

　　And since these messages have an agenda--to lure us to open our wallets-they make the very idea of happiness seem unreliable.

　　【析句】這是個簡單句，破折號前面是主句，破折號后面的不定式結構to lure us to open ourwallets修飾agenda 。