Complex sentence: So the graph of the Sun's declination, as seen from this highly tilted Earth, would not resemble a sine wave--it would be a sawtooth, zig-zagging between plus and minus 90 degrees, with linear segments between the maxima and minima.
Split into simpler sentences: So the graph of the Sun's declination, as seen from this highly tilted Earth, would not resemble a sine wave. Instead, it would be a sawtooth, zig-zagging between plus and minus 90 degrees, with linear segments between the maxima and minima.