which office holder's predecessor is henry sydney and his associate is sir john knatchbull ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_predecessor dbr_Henry_Sydney,_1st_Earl_of_Romney sep_dot var_uri dbo_associate dbr_Sir_John_Knatchbull,_2nd_Baronet sep_dot var_uri a dbo_OfficeHolder brack_close