Complex sentence: After Pam told Kevin he is not allowed to attend the wedding an argument started and Bill suffered a heart attack and was rushed into hospital, he later recovered but Pam still stuck by what she said and refused to let Kevin attend the wedding.
Split into simpler sentences: After Pam told Kevin he is not invited, this causes an argument and Bill suffers a heart attack and was rushed into hospital. He recovered but Pam stuck by what she said and refused to let Kevin attend the wedding.