YOU SAID:
My kitten laughed so hard it coughed!!
INTO JAPANESE
私の子猫は咳が激しくて笑った!
BACK INTO ENGLISH
My kitten coughed and laughed!
INTO JAPANESE
子猫が咳をして笑った!
BACK INTO ENGLISH
The kitten coughed and laughed!
it is unlikely that this phrase will ever reach equilibrium