Complex sentence: The theatre was threatened with demolition, and in 1986, the actor-manager Roland Muldoon mounted a campaign to acquire the freehold and to re-open the Hackney Empire as a permanent performance space; allowing the theatre to return to theatrical use for its 85th anniversary.
Split into simpler sentences: The theatre was threatened with demolition, and in 1986, the actor-manager Roland Muldoon mounted a campaign to acquire the freehold and to re-open the Hackney Empire as a permanent performance space. Allowing the theatre to return to theatrical use for its 85th anniversary.