The roof is sagging in numerous locations. Builders often splice roof rafters. This is a common practice. But roof rafter splicing has to be done properly. This next photo shows the way not to do it.
Spliced rafters have to be properly supported.
Hip rafters need to be blocked and supported at the ridge board. There is a craze out there for the installation of ridge vents. Most of the ridge vents we see installed are not properly installed. The openings cut into the ridge are normally too wide. This can cause the roof to leak during periods of wind driven rain.