(1) A tenant having a right of occupancy in land may, subject to the provisions of this Act and to the conditions of any written contract between him and his landlord, sublet the land or any part thereof for any term not exceeding seven years.
    (2) A person to whom land is sublet by a tenant having a right of occupancy therein shall, in respect of that land, and so far as regards the landlord, be, jointly with the tenant, subject to all the liabilities of the tenant under this Act.