Complex sentence: The technology allows for the card to be read at some distance from the reader, so contact is not required, and many people leave the card in their wallet and just pass the wallet over the reader as they enter the ticket gate.
Split into simpler sentences: The technology allows for the card to be read at some distance from the reader, so contact is not required. Many people leave the card in their wallet and just pass the wallet over the reader as they enter the ticket gate.