Complex sentence: Once, when Genie was suffering from constipation, her father forced her to drink an entire bottle of castor oil; the ensuing effect on her health was so serious that Genie's father allowed a physician to examine Genie, and Genie ultimately barely survived the incident.
Split into simpler sentences: Once, when Genie was suffering from constipation, her father forced her to drink an entire bottle of castor oil. The ensuing effect on her health was so serious that Genie's father allowed a physician to examine Genie, and Genie ultimately barely survived the incident.