Complex sentence: Sexton Blake is a fictional detective who appeared in many British comic strips and novels throughout the 20th century, described by Professor Jeffrey Richards on the BBC in'The Radio Detectives' in 2003 as "the poor man's Sherlock Holmes".
Split into simpler sentences: Sexton Blake is a fictional detective who appeared in many British comic strips and novels throughout the 20th century. He was described by Professor Jeffrey Richards on the BBC in "The Radio Detectives" in 2003 as "the poor man's Sherlock Holmes".