During the 1950s, Heerenveen regional dominance faded and after Dutch football turned professional Lenstra left to join Sportclub Enschede, before the club he departed was relegated to the Tweede Divisie. By the end of the decade, Heerenveen was in the Eerste Divisie, but found itself relegated again. In 1969–70, the Frisian club won the Tweede Divisie to return to the Eerste Divisie and for two seasons in the 1970s, the club was close to achieving promotion to the top-flight Eredivisie. By 1974, the club was in financial trouble and to ensure its survival it was split into amateur and professional sections on the 1st of June 1977, the professional part being renamed sc Heerenveen.