It’s too bad that the conditions can’t be written in a standard ‘logical’ expression notation which makes explicitly clear the meaning, as it would be in programming code or any high school math class (although in former days, and likely even today more often than not, many trainers and handicappers can’t even do basic math let alone logic).
As originally stated, the conditions read as follows, with no order of precedence between ‘logical clauses’ (which are shown in parenthesis):
(Fillies 3YO) AND (started for Claiming <= $50K) AND (NOT won 1 race other than Maiden or Claiming) OR (Claiming price today of $50K)
As several people have pointed out, that notation is ambiguous! The following notation, as FTL helpfully explained, is unambiguous:
(Fillies 3YO) AND ( EITHER (started for Claiming <= $50K AND NOT won 1 race other than Maiden or Claiming) OR (Claiming price of $50K) )
If you work out the logic values (i.e. TRUE or FALSE) within the parenthesis first, it becomes clearer.
Ted