Complex sentence: Mersin İdmanyurdu (MİY) attended Turkish Second Football League in 1963-64 season as Çukurova İdman Yurdu (ÇİY) (due to sponsorship reasons) and finished 5th.
Split into simpler sentences: Mersin İdmanyurdu (MİY) in 1963-64 season. MİY attended Turkey Second League 1963-64 season as Çukurova İdman Yurdu (ÇİY) (due to sponsorship reasons) and finished 5th.