Simplify the following text for a Grade 10 native English-speaking person.
Original: Bautzen is often regarded as the unofficial , but historical capital of Upper Lusatia , and it is the most important cultural center of the Sorbs , a Slavic people .
Simplified: Bautzen is historical capital of Upper Lusatia , and it is the most important cultural center of the Sorbs , a Slavic minority .