Simplify the following text for a Grade 8 native English-speaking person.
Original: The women 's suffrage movement began with the 1848 Seneca Falls Convention , organized by Elizabeth Cady Stanton and Lucretia Mott , and the Declaration of Sentiments demanding equal rights for women .
Simplified: By the 19th Century , women such as Lucretia Mott and Elizabeth Cady Stanton thought that women should have more rights .