Complex sentence: Modern Paraws have main sails in which the (more or less) vertical of the two spars is permanently attached in parallel to the shorter main mast, in addition the Paraw has a head sail or jib, the main sail resembles an equilateral triangle.
Split into simpler sentences: Modern paraws have main sails in which the (more or less) vertical of the two spars is permanently attached in parallel to the shorter main mast. In addition, the paraw has a head sail or jib, the main sail resembles an equilateral triangle.