I always keep the joins indented from the table that they are joined to:

  select    t1.col1,
            t2.col2,
            t3.col3,
            t4.col4
  from      table1 t1
                join table2 t2 on t2.colx = t1.colx
                join table3 t3 on t3.coly = t1.coly
                    join table4 t4 on t4.colz = t3.colz
                join tablen tn on tn.coln = t1.coln
  where     tn.colnx in (...)

            -- Table 3 and Table 2 have some values while Table n value is not something OR Table n has value that is exactly something
            and (
                    (t3.col = x and t2.col = y and tn.col != z)
                    or 
                    tn.col = z
                )
  ...

So in above you can see by the indent on which table some other table is joined to. Tables t2, t3 and tn are related to t1, but t4 is related to t3, not directly t1.