PERSON@1 -LRB- born December NUMBER@1 , NUMBER@2 in LOCATION@1 , LOCATION@2 -RRB- is a MISC@1 mixed martial artist -LRB- ORGANIZATION@1 -RRB- with a background in wrestling and LOCATION@3 , system of submission wrestling developed by his longtime , but now former , trainer PERSON@2 .

Diego `` The Nightmare '' PERSON@3 -LRB- born December NUMBER@1 , NUMBER@2 in LOCATION@1 , LOCATION@2 -RRB- is a MISC@2 mixed martial artist -LRB- MMA -RRB- . He has a background in wrestling and LOCATION@3 , a system of submission wrestling developed by his longtime trainer PERSON@2 .
