Complex sentence: Some enterprises try to self-collect or purchase email addresses to send junk emails, or they are deceived by senders of junk mails, consequently they cannot obtain expectant returns even being suffered from loss thereby.
Split into simpler sentences: Some enterprises try to self-collect or purchase email addresses to send junk emails, or they are deceived by senders of junk mails. Consequently they cannot obtain expectant returns even being suffered from loss thereby.