Simplify the following text for a Grade 7 native English-speaking person.
Original: In children , although a common appearance of the hymen is crescent-shaped , many variations are possible . After a woman gives birth , she may be left with remnants of the hymen , called carunculae myrtiformes , or the hymen may be completely absent .
Simplified: A woman 's hymen can also break while playing some sports and some women are also born without a hymen .