Complex sentence: Sergei Alphéraky was born into a noble Greek family of Alferakis, brother to composer Achilles Alferaki, his father Nikos Alferakis owned the Alferaki Palace in Taganrog.
Split into simpler sentences: Sergei Alphéraky was born into the noble Greek family of Alferakis and was the brother of composer Achilles Alferaki. His father Nikos Alferakis owned the Alferaki Palace in Taganrog.