Complex sentence: He joined Institute of Post Graduate Medicine and Research, Dhaka (now Bangabandhu Sheikh Mujib Medical University) in June 1970 and established cardiac unit and worked as Professor of Cardiology till June 1978.
Split into simpler sentences: He joined Institute of Post Graduate Medicine and Research, Dhaka (now Bangabandhu Sheikh Mujib Medical University) in June 1970 and established cardiac unit. Here, he worked as Professor of Cardiology till June 1978.