Complex sentence: In some genes these proteins may add a poly (A) tail at any one of several possible sites, polyadenylation can therefore produce more than one transcript from a single gene, similar to alternative splicing.
Split into simpler sentences: In some genes, these proteins may add a poly (A) tail at any one of several possible sites. Therefore, polyadenylation can produce more than one transcript from a single gene, similar to alternative splicing.