Complex sentence: Eventually, this led to a job with TSN in which he was first paired with Fergie Olver; when Olver was replaced by Jim Hughson in 1990, Martinez remained the color analyst.
Split into simpler sentences: Eventually, this led to a job with TSN in which he was first paired with Fergie Olver. When Olver was replaced by Jim Hughson in 1990, Martinez remained the color analyst.