Complex sentence: On September 8,2017, Hemme announced on YouTube that she was expecting quadruplets, three boys and a girl, due on January 6th 2018, sharing the same birthday as their big sister.
Split into simpler sentences: On September 8,2017, Hemme announced on YouTube that she's expecting quadruplets, 3 boys and a girl, due in January 6th 2018. They will be sharing the same birthday as their big sister.