Complex sentence: In late 1968, Siraj Sikder left the job to establish the Mao Tse Tung Research Centre in Dhaka but later on it was closed down by the Pakistan government.In February 1970,Siraj Sikder joined the Technical Training College in Dhaka as a Lecturer.
Split into simpler sentences: In late 1968, Siraj Sikder resigned from the service of the company, and established the Mao Tse Tung Research Centre in Dhaka. But soon the research centre was closed down by the Pakistan government.In February 1970,Siraj Sikder joined the Technical Training College in Dhaka as a Lecturer.