CREATE TABLE organisation_Types (organisation_type VARCHAR, organisation_type_description VARCHAR)
CREATE TABLE documents (sent_date VARCHAR, grant_id VARCHAR)
CREATE TABLE Grants (grant_id VARCHAR, organisation_id VARCHAR, grant_amount VARCHAR)
CREATE TABLE Organisations (organisation_id VARCHAR, organisation_type VARCHAR)

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" AND "T2"."grant_amount" > 5000 JOIN "Organisations" AS "T3" ON "T2"."organisation_id" = "T3"."organisation_id" JOIN "organisation_Types" AS "T4" ON "T3"."organisation_type" = "T4"."organisation_type" AND "T4"."organisation_type_description" = 'Research'