/usr/lib/libreoffice/program/simpress is in libreoffice-impress 1:4.3.3-2+deb8u11.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
cmd=`dirname "$0"`/soffice
exec "$cmd" --impress "$@"
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