contacts numbers from both accounts appear in the same contact number

hi dear
i have huawei 3c 4g lte phone . early days i store the contacts to phone account appears when creating a new contact account . i had got backup to my external memory chip also several times. then i suppose to syn to my gmail account the i store the new contacts to the gmail account when i create new contacts. i had 1802 contacts in my phone account and 1877 in my gmail account of phone . i have syc on october 2016 for last time .when i try to syc now it say you have 875 contact to dellete . then i select no . now i see one contact name contain two account inside the name as phone and the gmail.

how can i remove phone contact detail from gmail account inside of the a contact

thank you