Complex sentence: Sae is a very helpful and concerning mother as well-she and Sawa's father wanted to help Sawa sew the uniforms for Class 1-G, but Sawa rejected the offer.
Split into simpler sentences: Sae is a very helpful and concerning mother as well. She and Sawa's father wanted to help Sawa sew the uniforms for Class 1-G, but Sawa rejected the offer.