Complex sentence: The 1970 Formula One season included the 21st FIA Formula One World Championship season; in total, thirteen races were held between 7th March 1970 and 25th October 1970.
Split into simpler sentences: The 1970 Formula One season included the 21st FIA Formula One World Championship season. In total, thirteen races were held between 7th March 1970 and 25th October 1970.