Leo,
I hope that this is of some assistance -
11 reformed from 8./JG 54 (8.44)
12 reformed from 2./ JG 54 (8.44)
13 formed from 6./JG 54 (6.44)
14 formed from original 11./JG 54 (8.44)
15 Formed 9.44
16 Formed 9.44
The above from Rosch - Luftwaffe Codes, Markings and Units 1939-45 Page 218.
See also Holm
http://www.ww2.dk/ (Luftwaffe 1939-45) for a slightly differing view:-
"Reorganised in 8.44 (the old 12./JG54 became part of III./JG54):
13./JG54 from the old 10./JG54
14./JG54 from the old 11./JG54
15./JG54 from 4./JG54
16./JG54 from 6./JG54"