Complex sentence: On February 1,1972, the fare on the SIRT was increased for the first time since 1958, to 35 cents from an average fare of 22 cents; the system used to have zoned fares.
Split into simpler sentences: On February 1,1972, the fare on the SIRT was increased, for the first time since 1958, to thirty-five cents. The increase was from an average fare of twenty-two cents: the system used to have zoned fares.