However, ♦ when the Terrorism Prevention and Investigation Measures Act 2011 retains the power to relocate individuals to another part of the country without consent under powers for the secretary of state to impose enhanced TPIM notices. ♦ This, essentially emergency power may only be used, when Parliament is not in session, i.e. between the dissolution of a Parliament and the fi rst Queen’s Speech of the next Parliament.
Source: p 72, The English Legal System 2012-2013, Gary Slapper
Are there problems with the subordinate clause that I've surrounded with lozenges (♦)?