CREATE TABLE table_18795 ("Season" FLOAT, "Premiers" TEXT, "Runners Up" TEXT, "Score" TEXT, "Captain" TEXT, "Coach" TEXT, "Simpson Medal" TEXT, "Venue" TEXT, "Attendance" FLOAT, "Umpires" TEXT)

Who were the umpires when Paul Vines (S) won the Simpson Medal?
SELECT "Umpires" FROM table_18795 WHERE "Simpson Medal" = 'Paul Vines (S)'
SELECT "Umpires" FROM "table_18795" WHERE "Simpson Medal" = 'Paul Vines (S)'