Complex sentence: Some findings of the WHI were reconfirmed in a larger national study done in the UK, known as The Million Women Study, leading to a reduction in the number of post-menopausal women on hormone replacement therapy.
Split into simpler sentences: Some findings of the WHI were reconfirmed in a larger national study done in the UK, known as The Million Women Study. Coverage of the WHI findings led to a reduction in the number of post-menopausal women on hormone replacement therapy.