Find out the send dates of the documents with the grant amount of more than 5000 were granted by organisation type described
SELECT T1.sent_date FROM documents AS T1 JOIN Grants AS T2 ON T1.grant_id  =  T2.grant_id JOIN Organisations AS T3 ON T2.organisation_id  =  T3.organisation_id JOIN organisation_Types AS T4 ON T3.organisation_type  =  T4.organisation_type WHERE T2.grant_amount  >  5000 AND T4.organisation_type_description  =  'Research'
SELECT T1.sent_date FROM documents AS T1 JOIN Grants AS T2 ON T1.grant_id  =  T2.grant_id JOIN Organisations AS T3 ON T2.organisation_id  =  T3.organisation_id JOIN organisation_Types AS T4 ON T3.organisation_type  =  T4.organisation_type WHERE T2.grant_amount  >  5000 AND T4.organisation_type_description  =  'Research'
[{'sent_date': '1986-11-30 07:56:35'}, {'sent_date': '1979-07-04 08:54:23'}, {'sent_date': '2001-06-18 06:35:49'}, {'sent_date': '2002-07-26 15:50:28'}, {'sent_date': '1993-02-19 16:31:12'}, {'sent_date': '2000-06-06 01:03:46'}]