Complex sentence: The park began as 165 acres that was purchased by H. Keeney Lathrop and donated to the State of Connecticut and it was reported that the trout pools were developed for fishing by 1955.
Split into simpler sentences: The park began with a donation of 165 acres by H. Keeney Lathrop to the State of Connecticut. Even prior to the creation of the park, it was reported that the trout pools were developed for fishing by 1955.