This 不仅 ….而且 Mandarin Grammar can be translated as not only…. but also. In this case 不仅 bujin means not only, while erqie means also.
不仅 + 而且 not only, but also
Example 1:
毛泽东同志不仅伟大的政治家，思想家，军事家，而且是一位杰出诗人。MáoZédōng tóngzhì bùjǐn wěidàde zhèngzhìjiā sīxiǎngjiā ， jūnshìjiā， érqiě shì yīwèi jiéchū shīrén。
Mao Ze Dong was not only a great politician, philosopher and general, but also an esteemed poet.
不仅 + 也
A simple way of utilising this grammar is to use 也 yě meaning and also. For example:
中国不仅历史悠久，还有很多名胜古。 Zhōngguó bùjǐn lìshǐyōujiǔ háiyǒu hěnduō míngshèng gǔ。
Chinese not only has a rich history but also lot’s of interesting historical sites.
英 国 不 仅 有 悠 久 的 历 史 韩 国 的 历 史 也 非 常 悠 久.
Yīngguó bùjǐn yǒu yōujiǔ de lìshǐ Hánguó de lìshǐ yě fēicháng yōujiǔ
It’s not just Britain that has a long history, South Korea has a long history too.