Simplify the following text for a Grade 10 native English-speaking person.
Original: The Ottoman Dynasty ( or the Imperial House of Osman ) ruled the Ottoman Empire from 1299 to 1922 , beginning with Osman I ( not counting his father , ErtuÄ rul ) , though the dynasty was not proclaimed until Orhan Bey declared himself sultan .
Simplified: The Ottoman Dynasty ( or the Imperial House of Osman ) ruled the Ottoman Empire from 1299 to 1922 .