Complex sentence: Standard Bosnian is based on the most widespread dialect of Serbo-Croatian, Shtokavian, more specifically on Eastern Herzegovinian, which is also the basis of Standard Croatian, Serbian, and Montenegrin.
Split into simpler sentences: Standard Bosnian is a basis of the most widespread dialect of Serbo-Croatian, Shtokavian. More specifically Eastern Herzegovinian dialect of Bosnian, is the basis of Standard Croatian, Serbian, and Montenegrin.