Complex sentence: Roberts was approached by 14 teams after graduating from high school before being signed in June 1963 as an undrafted amateur free agent by the Philadelphia Phillies because they reportedly wanted to have a player of Jewish faith in the organization to attract the Jewish fan base.
Split into simpler sentences: Roberts was approached by 14 teams after graduating from high school. He was initially signed in June 1963 as an undrafted amateur free agent by the Philadelphia Phillies because they reportedly wanted to have a player of Jewish faith in the organization to attract the Jewish fan base.