Complex sentence: PayPai then sent account holders of PayPal bogus payment receipt notifications, mimicking those sent by PayPal, indicating that the account holder had received a large payment and directed recipients to paypai.com through a link in the message.
Split into simpler sentences: PayPai then sent account holders of PayPal bogus payment receipt notifications. Spam was sent out, mimicking these payment notifications and indicating that the account holder had received a large payment and directed recipients to paypai.com through a link in the message.