Complex sentence: Accordingly, the scores for texts do not reflect factors such as multiple levels of meaning or maturity of themes, and the US Common Core State Standards recommend the use of alternative, qualitative, methods for selecting books for students at grade 6 and over.
Split into simpler sentences: Accordingly, the scores for texts do not reflect factors such as multiple levels of meaning or maturity of themes. Hence, in the United States, the Common Core State Standards recommend the use of alternative, qualitative, methods for selecting books for students at grade 6 and over.