Simplify the following text for a Grade 12 native English-speaking person.
Original: In Roman Catholic and Eastern and Oriental Orthodox usage , the term `` virgin birth '' means not only that Mary was a virgin when she conceived and gave birth , but remained a virgin throughout her life , a belief attested since the 2nd century .
Simplified: But in Roman Catholic and Orthodox usage , the term `` Virgin Birth '' means not only that Mary was a virgin when she conceived , but also that she gave birth as a virgin ( remaining a virgo intacta ) .