Simplify the following text for a Grade 5 native English-speaking person.
Original: The roots of several demonstrations and meetings were planted in Folkets Hus , and as a result it was strongly linked to the great demonstration against unemployment in 1918 when workers stormed the Danish Stock Exchange ( BÃ rsen ) .
Simplified: In 1918 when workers stormed the Danish Stock Exchange ( BÃ rsen ) .