Complex sentence: Varela was built as an overcrowding relief school for G. Holmes Braddock High School and Miami Sunset High School; construction began in 1998 but due to several delays during construction (mainly concerning funding and local area politics) the school's opening was pushed back several times.
Split into simpler sentences: Varela was built as an overcrowding reliever for G. Holmes Braddock High School and construction began in 1998. Due to several delays in construction, mainly concerning funding and local area politics, the school's opening was pushed back several times.