Statement 2 says that 'others believe that complex identities.... This statement suggests that there must be a similar but slightly contrary belief immediately in the sentence preceding sentence 2.5 says complex identities are beneficial, while 2 says that complex identities confuse. Thus 5 and 2 form a pair. 4 introduces the idea of identity and thus becomes the opening sentence of the paragraph. Since 3 introduces the idea of 'complex identities', it must come before 52 pair. Thus we have 4352 coming together to form a coherent paragraph. 1 is the odd one out.