Simplify the following text for a Grade 10 native English-speaking person.
Original: `` Our Friend is so contented with our girlies , says they have gone through heavy ` courses ' for their age and their souls have much developed , '' Alexandra wrote to Nicholas on December 6 , 1916 .
Simplified: `` Our Friend is so contented ( happy ) with our girlies , souls have much developed , '' Alexandra wrote to Nicholas on December 6 , 1916 .