Is this good?
Harris felt it. It just wasn't the same anymore. Their conversations lacked the usual spark. She didn't smile the way she used to when she saw him. The level of their adrenaline gradually faded after eight years of marriage.
I'd also delete some words in a couple of places. Can you guess where?
I'm not a teacher. I speak American English. I've tutored writing at the University of Southern Maine and have done a good deal of copy editing and writing, occasionally for publication.
These?
Harris felt it. It just wasn't the same anymore. Their conversations lacked the usual spark. She didn't smile the way she used to when she saw him.
Does this sentence work?
Their level of their adrenaline for one another gradually faded after eight years of marriage.