Complex sentence: Several algorithms have been devised to partition chromosomal regions into haplotype blocks which are based on haplotype diversity, LD, four-gamete test and information complexity and tag SNPs are selected from all SNPs that belong to that block.
Split into simpler sentences: Several algorithms have been devised to partition chromosomal regions into haplotype blocks which are based on haplotype diversity, LD, four-gamete test and information complexity. Then tag SNPs are selected from all SNPs that belong to that block.