Complex sentence: Several speculations have been put forward as to exactly who her father was, but his identity is still uncertain; he is guessed to have been Prince Volodar of Minsk or Prince Vladimir of Halicz.
Split into simpler sentences: Several speculations have been put forward as to exactly who her father was, but his identity is still uncertain. It is guessed to have been Prince Volodar of Minsk or Prince Vladimir of Halicz.