Complex sentence: Sergei Makarov was a controversial winner of the Calder Memorial Trophy in 1989--90 as won the rookie of the year award at the age of 31 after spending 13 seasons in the Soviet League.
Split into simpler sentences: Sergei Makarov was a controversial winner of the Calder Memorial Trophy in 1989--90. He won the rookie of the year award at the age of 31 after spending 13 seasons in the Soviet League.