Who is the management and coach of these two athletes?
I found that Davor Savija was Joyce's management, but that link was from 2015, so I am not sure that is current. Prior to that she was managed by Zane Branson who died of a heart attack in Kenya in 2014, but Davor was his business partner, so I kind of assume he just took over management of any clients. Her current management appears to be Gianni Demadonna. At one point she was coached by her husband Erick Kibet. Again I am not sure that is up to date but I can find a date confirming that for 2018.
I found an interview with Joyce in which she says her best friend in running is Emily Chebet, who was also banned for doping. And yes, many many references going back years to Florence Kiplagat being her partner as well.
Jacob Kibet Chuylo Kendagor is managed by Frans Dennison. Can't find any information on a coach or training partners. Maybe I will look again later and see if I can dig that up.