Complex sentence: Shaikh Jassim bin Hamad bin Abdullah bin Jassim bin Muhammed Al Thani was the eldest son of Hamad, himself the second son and heir apparant of the ruler of Qatar, but who died (in 1948) before his father.
Split into simpler sentences: Shaikh Jassim bin Hamad bin Abdullah bin Jassim bin Muhammed Al Thani. Jassim was the eldest son of Hamad, himself the second son and heir apparant of the ruler of Qatar, but who died (in 1948) before his father.