Complex sentence: About one-third of people (~ 30%) in industrialized nations are presently diagnosed with cancer during their lifetimes, radiation exposure can increase cancer risk, with the cancers that arise being indistinguishable from cancers resulting from other causes.
Split into simpler sentences: About one-third of people (~ 30%) in industrialized nations are presently diagnosed with cancer during their lifetimes. Radiation exposure can increase cancer risk, with the cancers that arise being indistinguishable from cancers resulting from other causes.