Complex sentence: He began his journalistic career at the "Southport Visiter" in 1974 before moving to the sister paper called the "Bootle Times" and becoming its News Editor in 1977.
Split into simpler sentences: He began his journalistic career at the Southport Visiter in 1974. Moved to the sister paper of the Southport Visiter called the Bootle Times becoming its News Editor in 1977.