Amateur,
1. Ave $$$ means the top five horses re their prizemoney earned per start. Eg 20 starts, $120000 = $6000 average per start. It's a class filter ( pretty raw though ).
2. 50%+ distance places means .. eg 5 starts at distance for 1 win 2 places is ok, 1 win 0 places or 1 place is not.
3. Sri Lanka and Kurrajong Mist must have either a) not met 5 or 6 of the 6 criteria b) been in a race where another horse met the same criteria and therefore was a no bet race or c) I'd had too many beers and missed them.