Complex sentence: It was very well-received by critics in the U.S., after many months of being shown at various festivals and film events, receiving a "Fresh" score of 77% on Rotten Tomatoes.
Split into simpler sentences: It was very well-received by critics in the U.S., after many months of being shown at various festivals and film events. It's thus far received a "Fresh" score of 77% on Rotten Tomatoes.