Complex sentence: From the 1980s until the end of the cold war, the BBC planned to broadcast for only a few hours a day and for a few minutes each hour, the intention being to save batteries in people's radios.
Split into simpler sentences: From the 1980s until the end of the cold war, the BBC planned to broadcast for only a few hours a day and for a few minutes each hour. The intention being to save batteries in people's radios.