Complex sentence: The infrastructure and standard procedures for the database were established by Arnold Greyling over the period from 1998 to 2005, during which time he acted as database custodian and assisted in establishing a working relationship between SAPS and the INTERPOL DNA Monitoring Expert Group.
Split into simpler sentences: The infrastructure and standard procedures for the database were established by Arnold Greyling over the period from 1998 to 2005. During this time period, he acted as database custodian and assisted in establishing a working relationship between SAPS and the INTERPOL DNA Monitoring Expert Group.