Complex sentence: Mr. Melas, a Greek interpreter, tells a rather unnerving experience to Mycroft Holmes, who like his little brother Sherlock Holmes, is remarkably endowed with powers of observation and deduction.
Split into simpler sentences: Mr. Melas, a Greek interpreter, tells a rather unnerving experience to Mycroft Holmes. Mycroft, like his younger brother Sherlock Holmes, is remarkably endowed with powers of observation and deduction.