Complex sentence: In the big Healey, he finished 5th in the RAC Rally in 1963, drove Minis during most of 1964 but came second in the RAC Rally, in a Healey, at the end of that year.
Split into simpler sentences: In the big Healey, he finished fifth in the RAC Rally in 1963. Mäkinen drove Minis during most of 1964 but came second in the RAC Rally in a Healey, at the end of that year.