Sentence fragments are incomplete sentences. They may be caused by different problems. See also Punctuation.
In example 1, there is a clause (i.e. a dependent sentence) starting with a relative pronoun, but there is no main clause.
 

 

WRONG
RIGHT

1.

Which directly advances the creative industry development.

This directly advances the creative industry development..

 

Missing subject

In English, every sentence should have an explicit subject.

In example 2 the subject is missing.

 

WRONG
RIGHT

1.

Aims to conserve valuable buildings and promote creative activities, such as topical exhibitions, handmade marketplaces, workshops, and pop-up stores.

This aims to conserve valuable buildings and promote creative activities, such as topical exhibitions, handmade marketplaces, workshops, and pop-up stores.

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Click here for a quiz on sentence fragments.

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