Simplify the following text for a Grade 6 native English-speaking person.
Original: A group of children protested at the zoo , holding up placards reading `` Knut Must Live '' and `` We Love Knut '' , and others sent numerous emails and letters asking for the cub 's life to be spared .
Simplified: A group of children protested at the zoo , holding up signs that read `` Knut Must Live '' and `` We Love Knut '' . Others sent emails and letters asking for the cub 's life to be spared .