Complex sentence: One lab study revealed an increase in the liking of prices when they were secretly manipulated to match subjects birthday dates, resulting in a higher chance of purchase; but a second study using birth year as price did not lead to the same result.
Split into simpler sentences: One lab study revealed an increase in a favourable attitude towards prices when they were secretly manipulated to match subjects birthday dates, thus resulting in a higher chance of purchase. However a second study using birth year as price did not lead to the same result.