grammar

[chrysanthemum]

..., Then perhaps this is a clear and valid choice for people to be making.
Work is becoming too important for it to be of dubious quality.
Will you please explain the structure of the underlined parts?

[BobK]

..., Then perhaps this is a clear and valid choice for people to be making.They often do it.
Work is becoming too important for it to be of dubious quality.The importance of work is increasing [Further context would be necessary to explain why.] Because it's more important, it's less acceptable that it should be of dubious [=doubtful/dodgy (informal)/bad/low...] quality.
Will you please explain the structure of the underlined parts?

b