Complex sentence: Yordanidis is unknown to the Association of Road Racing Statisticians who maintains a list of single age records and currently lists Fauja Singh and Jenny Wood-Allen as the oldest male and female marathon record holders in the 90 + age group.
Split into simpler sentences: Yordanidis is unknown to the Association of Road Racing Statisticians, which maintains a list of single age records. It currently lists Fauja Singh and Jenny Wood-Allen as the oldest male and female marathon record holders in the 90 + age group.