Simplify the following text for a Grade 7 native English-speaking person.
Original: The Core brand comprised two branches : the Duo ( dual-core ) and Solo ( Duo with one disabled core , which replaced the Pentium M brand of single-core mobile processor ) .
Simplified: In the Core family , there are two groups : the Duo ( with two cores ) and Solo ( Duo with one disabled core ) . The Solo line replaced the Pentium M one-core processor .