Complex sentence: His departure was due to his unwillingness to accept a pay cut to stay on with Frankfurt and made him become a team-mate of Gerd Müller at Fort Lauderdale Strikers in the United States.
Split into simpler sentences: His departure was due to his unwillingness to accept a pay cut to stay on with Frankfurt. He become a team-mate of Gerd Müller at Fort Lauderdale Strikers in the United States.