Complex sentence: In fact, only 15 to 20 per cent of the population can afford treatment at private hospitals; the rest have to depend on hospitals like the Adyar Cancer Institute or government hospitals where treatment is either free or subsidised.
Split into simpler sentences: In fact, only 15--20% of the population can afford treatment at private hospitals. The rest must depend on hospitals like the Adyar Cancer Institute or government hospitals, where treatment is either free or subsidised.