Simplify the following text for a Grade 9 native English-speaking person.
Original: As the Whites ( loyalists still faithful to the Tsar and the principles of autocracy ) advanced toward Yekaterinburg the Reds were in a precarious situation .
Simplified: As the Whites ( people who were still faithful to the Tsar and autocracy ) came more toward Yekaterinburg , the Reds felt afraid .