Complex sentence: After Bachmann's conviction, he and Dutschke corresponded by letter; however it is controversial how much the letters interested Bachmann and whether the contact influenced him when he committed suicide on the night between February 23 and February 24,1970.
Split into simpler sentences: After Bachmann's conviction, he and Dutschke corresponded by letter. Bachmann committed suicide on the night between February 23 and February 24,1970.