Sentence:  In the symbiotic effect, a hard ligand tends to form ionic M-L bonds in which L retains more negative charge than in a soft ligand case, letting the metal ion keep more of its positive charge and hence attract additional hard ligands, .... The antisymbiotic effect, also called <WSD>transphobia</WSD>, applies to pairs of high trans effect, soft ligands on a soft metal. Where a choice exists, there is a strong tendency for such ligands to avoid being mutually trans by becoming cis and preferring to have low trans effect, hard ligands trans to themselves. 
Meaning of the word marked with <WSD> tags:  The preference of pairs of high-trans effect soft ligands to avoid being mutually trans by becoming cis and having other low-trans effect hard ligands trans to themselves.