Complex sentence: Keiko reported in a subsequent magazine interview that childbirth was a rewarding, but strenuous experience for her second stage labor required nearly ten hours of rigorous pushing for her to deliver her child.
Split into simpler sentences: Keiko reported in a subsequent magazine interview that childbirth was a rewarding, but strenuous experience for her. Keiko's second stage labor required nearly ten hours of rigorous pushing for her to deliver her child.