Final answer:
The sentence in question is written in the present perfect tense. This tense indicates actions that have happened at an unspecified time before now and are relevant to the present situation.
Step-by-step explanation:
The tense described in the sentence 'He has refused for a long time after such dissolutions' is the present perfect tense.
The present perfect tense is used to express actions that have occurred at an unspecified time before now and have relevance to the present moment.
The construction of this tense uses 'has' or 'have' with the past participle of the verb ('refused' in this case).