Yes,its true that before getting advance in your spoken english,you need to go with the simple english.when you will speak english consistently with those simple words in your language,then you will get more confidence.
Slowly,slowly you fluency in english will improve.
It is best to speak shorter sentences and simple every day words even if you can proficiently use difficult words and big sentences. The purpose of communication is defeated if you are not understood. Simple and plain English ensures that you will be understood well by all.
It is difficult to make complex sentences in spoken English as the time element is there! So go for shorter ones framed in common words!
