Complex sentence: At 2:15pm, as the motorcade passed through the gate, Ilyin drew pistols in both hands: ignoring the waving astronauts, he opened fire on the second car in the line, assuming that it carried Brezhnev.
Split into simpler sentences: At 2:15pm, as the motorcade passed through the gate, Ilyin drew pistols in both hands. Ignoring the waving cosmonauts, he opened fire on the second car in the line, assuming that it carried Brezhnev.