Complex sentence: Caesar originally planned to build the temple to Venus Victrix, but the Battle of Pharsalus in 48 BCE postponed the construction, however, Pompey, because of his love for Venus, decided to dedicate his own temple to Venus Genetrix.
Split into simpler sentences: Caesar originally planned to build the temple to Venus Victrix, but the Battle of Pharsalus in 48 BCE postponed the construction. His rival Pompey, because of his love for Venus, decided to dedicate his own temple to Venus Genetrix.