Complex sentence: Surveillance of Cook is also reported to have involved physically following him and his young children, attempts to access his voicemail and that of his wife, and possibly attempts to send a "Trojan horse" email in an attempt to steal information from his computer.
Split into simpler sentences: Surveillance of Cook is also reported to have involved physically following him and his young children. It included attempts to access his voicemail and that of his wife, and possibly attempts to send a "Trojan horse" email to try to steal information from his computer.