Correct

不简单

/ bùjiǎndān / 
Strokes

Definition

not simple/rather complicated/remarkable/marvelous

Example

As an Adjective

not simple; fairly/rather complicated

1
Zhè
这
shìr  
事儿
bù
不
xiàng
像
kàn
看
qǐlai
起来
nàme
那么
jiǎndān
简单
  
。

The matter is not so simple as it seems to be.

As an Adjective

remarkable; marvellous; outstanding

2
Tèqū
特区
shí
十
nián
年
zhīnèi
之内
yǒu
有
zhème
这么
dà
大
chéngjiù
成就
  
,
zhēn
真
bù
不
jiǎndān
简单
  
。

It is remarkable for the special economic zone (SEZ) to have accomplished so much over the past decade.