Complex sentence: Some secondary schools in New Zealand, mainly private ones, offer entrance scholarships based on sporting ability, but these have been restricted in recent years by the New Zealand Secondary School Sports Council's (NZSSSC) anti-poaching rules.
Split into simpler sentences: Some secondary schools in New Zealand, mainly private ones, offer entrance scholarships based on sporting ability. However, these have been restricted in recent years by the New Zealand Secondary School Sports Council's (NZSSSC) anti-poaching rules.