Complex sentence: Pinault also paid for a completed re-construction of the stadium and also invested in the transfer market, recruiting several players from South America, most notably Lucas Severino, whom Rennes paid a record €21 million for.
Split into simpler sentences: Pinault also paid for a completed re-construction of the stadium. He also invested in the transfer market recruiting several players from South America, most notably Lucas Severino, whom Rennes paid a record €21 million for.