Complex sentence: In the past, Dell has modified some existing Inspiron machines to produce computers of higher or lower quality, for example, the first-generation Inspiron XPS and Inspiron 9100 (2004--2006).
Split into simpler sentences: In the past, Dell has modified some existing Inspiron machines to produce computers of higher or lower quality. Note for example, the first-generation Inspiron XPS and Inspiron 9100 (2004--2006).