Complex sentence: In June 1983, Engine Co.302 and Engine Co.311 were re-activated, with Engine 302 quartered at Station 1/Fire Headquarters, only to be de-commissioned once again a month later (Engine 302 would never to return to front line service).
Split into simpler sentences: In June 1983, Engine Co.302 and Engine Co.311 were re-commissioned, with Engine 302 quartered at Station 1/Fire Headquarters. However one month later both companies (Engine 302 and Engine 311) were de-commissioned once again (Engine 302 would never to return to front line service).