Complex sentence: In 1977, however, the Penn Wood Players began to make plans to make the Arcadia their headquarters; but the Johnstown Flood of 1977 severely damaged the building and the theater was once again closed.
Split into simpler sentences: In 1977, however, the Penn Wood Players began to make plans to make the Arcadia their headquarters. Unfortunately the Johnstown Flood of 1977 severely damaged the building and the theater was once again closed.