Complex sentence: Gustafsson recieved several employment offers from major European clubs but was not interrested in leaving the club he had worked for since 1983 as manager for both youth teams and the first squad.
Split into simpler sentences: Gustafsson recieved several employment offers from major European clubs. However, he indicated that he was not interrested in leaving the club that he had worked for since 1983 as manager for both youth teams and the first squad.