Morozov played 7 years for the Pittsburgh Penguins which was his entire NHL career before going back to play in his home country. Morozov was a Russian Player with skill but it never really translated to the NHL, at least on the scoring side of the puck.
He played only 451 career games in the NHL, and finished with 219 career points. The years he performed the worst offensively, were the years the Pens had depth and talent were able to play deep into the playoffs. His final 3 seasons, the Pens were not nearly as talented and he was relied upon to be more than really what he was capable of. In his defense though, those 3 seasons were his best in as far as numbers registering career highs in goals and points during those years.
After he left the Penguins in the 2003-2004 season, he went back to play for Kazan Ak-Bars in the Russian League, where his skills stood out and he was able to put some much higher numbers on the board. He then went and played in the Russian KHL where the competition was stronger and his numbers returned to what they were in the NHL. Which was scoring around 50 points a season.